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Finding the Fourth Proportional to 528.60, 728.70 and 353.64

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Solution

The fourth proportional to 528.60, 728.70 and 353.64 is: 487.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.60 : 728.70 = 353.64 : x
  2. Step 2: Convert to fraction form
    528.60/728.70 = 353.64/x
  3. Step 3: Cross multiply
    528.60x = 728.70 × 353.64
  4. Step 4: Simplify right side
    528.60x = 257,697.47
  5. Step 5: Solve for x
    x = 257,697.47/528.60
  6. Step 6: Final answer
    x = 487.51

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.