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Finding the Fourth Proportional to 528.50, 732.45 and 520.40

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Solution

The fourth proportional to 528.50, 732.45 and 520.40 is: 721.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.50 : 732.45 = 520.40 : x
  2. Step 2: Convert to fraction form
    528.50/732.45 = 520.40/x
  3. Step 3: Cross multiply
    528.50x = 732.45 × 520.40
  4. Step 4: Simplify right side
    528.50x = 381,166.98
  5. Step 5: Solve for x
    x = 381,166.98/528.50
  6. Step 6: Final answer
    x = 721.22

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.