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Finding the Fourth Proportional to 1,432.64, 2,147.68 and 520

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Solution

The fourth proportional to 1,432.64, 2,147.68 and 520 is: 779.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.64 : 2,147.68 = 520 : x
  2. Step 2: Convert to fraction form
    1,432.64/2,147.68 = 520/x
  3. Step 3: Cross multiply
    1,432.64x = 2,147.68 × 520
  4. Step 4: Simplify right side
    1,432.64x = 1,116,793.60
  5. Step 5: Solve for x
    x = 1,116,793.60/1,432.64
  6. Step 6: Final answer
    x = 779.54

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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.