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Finding the Fourth Proportional to 1,001.20, 1,381.80 and 651.28

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Solution

The fourth proportional to 1,001.20, 1,381.80 and 651.28 is: 898.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.20 : 1,381.80 = 651.28 : x
  2. Step 2: Convert to fraction form
    1,001.20/1,381.80 = 651.28/x
  3. Step 3: Cross multiply
    1,001.20x = 1,381.80 × 651.28
  4. Step 4: Simplify right side
    1,001.20x = 899,938.70
  5. Step 5: Solve for x
    x = 899,938.70/1,001.20
  6. Step 6: Final answer
    x = 898.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.