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Finding the Fourth Proportional to 528.90, 729.84 and 307.92

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Solution

The fourth proportional to 528.90, 729.84 and 307.92 is: 424.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.90 : 729.84 = 307.92 : x
  2. Step 2: Convert to fraction form
    528.90/729.84 = 307.92/x
  3. Step 3: Cross multiply
    528.90x = 729.84 × 307.92
  4. Step 4: Simplify right side
    528.90x = 224,732.33
  5. Step 5: Solve for x
    x = 224,732.33/528.90
  6. Step 6: Final answer
    x = 424.91

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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.