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Finding the Fourth Proportional to 657.76, 904.80 and 631.12

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Solution

The fourth proportional to 657.76, 904.80 and 631.12 is: 868.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.76 : 904.80 = 631.12 : x
  2. Step 2: Convert to fraction form
    657.76/904.80 = 631.12/x
  3. Step 3: Cross multiply
    657.76x = 904.80 × 631.12
  4. Step 4: Simplify right side
    657.76x = 571,037.38
  5. Step 5: Solve for x
    x = 571,037.38/657.76
  6. Step 6: Final answer
    x = 868.15

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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.