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Finding the Fourth Proportional to 708.88, 978.14 and 406.02

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Solution

The fourth proportional to 708.88, 978.14 and 406.02 is: 560.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.88 : 978.14 = 406.02 : x
  2. Step 2: Convert to fraction form
    708.88/978.14 = 406.02/x
  3. Step 3: Cross multiply
    708.88x = 978.14 × 406.02
  4. Step 4: Simplify right side
    708.88x = 397,144.40
  5. Step 5: Solve for x
    x = 397,144.40/708.88
  6. Step 6: Final answer
    x = 560.24

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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.