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Finding the Fourth Proportional to 708.87, 978.17 and 656.62

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Solution

The fourth proportional to 708.87, 978.17 and 656.62 is: 906.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.87 : 978.17 = 656.62 : x
  2. Step 2: Convert to fraction form
    708.87/978.17 = 656.62/x
  3. Step 3: Cross multiply
    708.87x = 978.17 × 656.62
  4. Step 4: Simplify right side
    708.87x = 642,284.34
  5. Step 5: Solve for x
    x = 642,284.34/708.87
  6. Step 6: Final answer
    x = 906.07

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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.