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Finding the Fourth Proportional to 708.80, 978.56 and 476.16

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Solution

The fourth proportional to 708.80, 978.56 and 476.16 is: 657.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.80 : 978.56 = 476.16 : x
  2. Step 2: Convert to fraction form
    708.80/978.56 = 476.16/x
  3. Step 3: Cross multiply
    708.80x = 978.56 × 476.16
  4. Step 4: Simplify right side
    708.80x = 465,951.13
  5. Step 5: Solve for x
    x = 465,951.13/708.80
  6. Step 6: Final answer
    x = 657.38

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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.