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Finding the Fourth Proportional to 528.89, 729.68 and 307.76

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Solution

The fourth proportional to 528.89, 729.68 and 307.76 is: 424.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.89 : 729.68 = 307.76 : x
  2. Step 2: Convert to fraction form
    528.89/729.68 = 307.76/x
  3. Step 3: Cross multiply
    528.89x = 729.68 × 307.76
  4. Step 4: Simplify right side
    528.89x = 224,561.13
  5. Step 5: Solve for x
    x = 224,561.13/528.89
  6. Step 6: Final answer
    x = 424.59

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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.