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Finding the Fourth Proportional to 529.60, 793.28 and 438.08

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Solution

The fourth proportional to 529.60, 793.28 and 438.08 is: 656.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.60 : 793.28 = 438.08 : x
  2. Step 2: Convert to fraction form
    529.60/793.28 = 438.08/x
  3. Step 3: Cross multiply
    529.60x = 793.28 × 438.08
  4. Step 4: Simplify right side
    529.60x = 347,520.10
  5. Step 5: Solve for x
    x = 347,520.10/529.60
  6. Step 6: Final answer
    x = 656.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.