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Finding the Fourth Proportional to 1,170.69, 1,615.49 and 646.69

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Solution

The fourth proportional to 1,170.69, 1,615.49 and 646.69 is: 892.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.69 : 1,615.49 = 646.69 : x
  2. Step 2: Convert to fraction form
    1,170.69/1,615.49 = 646.69/x
  3. Step 3: Cross multiply
    1,170.69x = 1,615.49 × 646.69
  4. Step 4: Simplify right side
    1,170.69x = 1,044,716.38
  5. Step 5: Solve for x
    x = 1,044,716.38/1,170.69
  6. Step 6: Final answer
    x = 892.39

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Half scale
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Double scale
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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.