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Finding the Fourth Proportional to 1,170.67, 1,615.50 and 646.69

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Solution

The fourth proportional to 1,170.67, 1,615.50 and 646.69 is: 892.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.67 : 1,615.50 = 646.69 : x
  2. Step 2: Convert to fraction form
    1,170.67/1,615.50 = 646.69/x
  3. Step 3: Cross multiply
    1,170.67x = 1,615.50 × 646.69
  4. Step 4: Simplify right side
    1,170.67x = 1,044,723.66
  5. Step 5: Solve for x
    x = 1,044,723.66/1,170.67
  6. Step 6: Final answer
    x = 892.42

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.