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Finding the Fourth Proportional to 708.99, 978.72 and 457.28

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Solution

The fourth proportional to 708.99, 978.72 and 457.28 is: 631.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.99 : 978.72 = 457.28 : x
  2. Step 2: Convert to fraction form
    708.99/978.72 = 457.28/x
  3. Step 3: Cross multiply
    708.99x = 978.72 × 457.28
  4. Step 4: Simplify right side
    708.99x = 447,549.08
  5. Step 5: Solve for x
    x = 447,549.08/708.99
  6. Step 6: Final answer
    x = 631.25

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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.