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Finding the Fourth Proportional to 469.52, 703.20 and 387.80

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Solution

The fourth proportional to 469.52, 703.20 and 387.80 is: 580.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.52 : 703.20 = 387.80 : x
  2. Step 2: Convert to fraction form
    469.52/703.20 = 387.80/x
  3. Step 3: Cross multiply
    469.52x = 703.20 × 387.80
  4. Step 4: Simplify right side
    469.52x = 272,700.96
  5. Step 5: Solve for x
    x = 272,700.96/469.52
  6. Step 6: Final answer
    x = 580.81

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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.