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Finding the Fourth Proportional to 528.90, 729.94 and 307.78

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Solution

The fourth proportional to 528.90, 729.94 and 307.78 is: 424.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.90 : 729.94 = 307.78 : x
  2. Step 2: Convert to fraction form
    528.90/729.94 = 307.78/x
  3. Step 3: Cross multiply
    528.90x = 729.94 × 307.78
  4. Step 4: Simplify right side
    528.90x = 224,660.93
  5. Step 5: Solve for x
    x = 224,660.93/528.90
  6. Step 6: Final answer
    x = 424.77

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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.