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Finding the Fourth Proportional to 528.66, 729.47 and 307.61

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Solution

The fourth proportional to 528.66, 729.47 and 307.61 is: 424.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.66 : 729.47 = 307.61 : x
  2. Step 2: Convert to fraction form
    528.66/729.47 = 307.61/x
  3. Step 3: Cross multiply
    528.66x = 729.47 × 307.61
  4. Step 4: Simplify right side
    528.66x = 224,392.27
  5. Step 5: Solve for x
    x = 224,392.27/528.66
  6. Step 6: Final answer
    x = 424.45

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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.