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Finding the Fourth Proportional to 1,332.72, 1,999.80 and 511.56

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Solution

The fourth proportional to 1,332.72, 1,999.80 and 511.56 is: 767.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.72 : 1,999.80 = 511.56 : x
  2. Step 2: Convert to fraction form
    1,332.72/1,999.80 = 511.56/x
  3. Step 3: Cross multiply
    1,332.72x = 1,999.80 × 511.56
  4. Step 4: Simplify right side
    1,332.72x = 1,023,017.69
  5. Step 5: Solve for x
    x = 1,023,017.69/1,332.72
  6. Step 6: Final answer
    x = 767.62

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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.