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Finding the Fourth Proportional to 1,170.69, 1,615.55 and 646.75

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Solution

The fourth proportional to 1,170.69, 1,615.55 and 646.75 is: 892.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.69 : 1,615.55 = 646.75 : x
  2. Step 2: Convert to fraction form
    1,170.69/1,615.55 = 646.75/x
  3. Step 3: Cross multiply
    1,170.69x = 1,615.55 × 646.75
  4. Step 4: Simplify right side
    1,170.69x = 1,044,856.96
  5. Step 5: Solve for x
    x = 1,044,856.96/1,170.69
  6. Step 6: Final answer
    x = 892.51

Related Problems

Find fourth proportional to 585.35, 807.78 and 323.38
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.