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Finding the Fourth Proportional to 528.71, 729.59 and 307.63

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Solution

The fourth proportional to 528.71, 729.59 and 307.63 is: 424.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.71 : 729.59 = 307.63 : x
  2. Step 2: Convert to fraction form
    528.71/729.59 = 307.63/x
  3. Step 3: Cross multiply
    528.71x = 729.59 × 307.63
  4. Step 4: Simplify right side
    528.71x = 224,438.59
  5. Step 5: Solve for x
    x = 224,438.59/528.71
  6. Step 6: Final answer
    x = 424.50

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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.