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Finding the Fourth Proportional to 708.74, 978.38 and 457.03

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Solution

The fourth proportional to 708.74, 978.38 and 457.03 is: 630.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.74 : 978.38 = 457.03 : x
  2. Step 2: Convert to fraction form
    708.74/978.38 = 457.03/x
  3. Step 3: Cross multiply
    708.74x = 978.38 × 457.03
  4. Step 4: Simplify right side
    708.74x = 447,149.01
  5. Step 5: Solve for x
    x = 447,149.01/708.74
  6. Step 6: Final answer
    x = 630.91

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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.