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Finding the Fourth Proportional to 1,332.95, 1,999.28 and 511.21

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Solution

The fourth proportional to 1,332.95, 1,999.28 and 511.21 is: 766.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.95 : 1,999.28 = 511.21 : x
  2. Step 2: Convert to fraction form
    1,332.95/1,999.28 = 511.21/x
  3. Step 3: Cross multiply
    1,332.95x = 1,999.28 × 511.21
  4. Step 4: Simplify right side
    1,332.95x = 1,022,039.38
  5. Step 5: Solve for x
    x = 1,022,039.38/1,332.95
  6. Step 6: Final answer
    x = 766.75

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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.