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Finding the Fourth Proportional to 708.79, 978.14 and 425.35

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Solution

The fourth proportional to 708.79, 978.14 and 425.35 is: 586.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.79 : 978.14 = 425.35 : x
  2. Step 2: Convert to fraction form
    708.79/978.14 = 425.35/x
  3. Step 3: Cross multiply
    708.79x = 978.14 × 425.35
  4. Step 4: Simplify right side
    708.79x = 416,050.47
  5. Step 5: Solve for x
    x = 416,050.47/708.79
  6. Step 6: Final answer
    x = 586.99

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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.