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Finding the Fourth Proportional to 528.60, 729.90 and 354.72

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Solution

The fourth proportional to 528.60, 729.90 and 354.72 is: 489.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.60 : 729.90 = 354.72 : x
  2. Step 2: Convert to fraction form
    528.60/729.90 = 354.72/x
  3. Step 3: Cross multiply
    528.60x = 729.90 × 354.72
  4. Step 4: Simplify right side
    528.60x = 258,910.13
  5. Step 5: Solve for x
    x = 258,910.13/528.60
  6. Step 6: Final answer
    x = 489.80

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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.