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Finding the Fourth Proportional to 578.47, 868.14 and 424.79

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Solution

The fourth proportional to 578.47, 868.14 and 424.79 is: 637.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.47 : 868.14 = 424.79 : x
  2. Step 2: Convert to fraction form
    578.47/868.14 = 424.79/x
  3. Step 3: Cross multiply
    578.47x = 868.14 × 424.79
  4. Step 4: Simplify right side
    578.47x = 368,777.19
  5. Step 5: Solve for x
    x = 368,777.19/578.47
  6. Step 6: Final answer
    x = 637.50

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Half scale
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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.