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Finding the Fourth Proportional to 528.30, 729.15 and 307.28

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Solution

The fourth proportional to 528.30, 729.15 and 307.28 is: 424.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.30 : 729.15 = 307.28 : x
  2. Step 2: Convert to fraction form
    528.30/729.15 = 307.28/x
  3. Step 3: Cross multiply
    528.30x = 729.15 × 307.28
  4. Step 4: Simplify right side
    528.30x = 224,054.59
  5. Step 5: Solve for x
    x = 224,054.59/528.30
  6. Step 6: Final answer
    x = 424.11

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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.