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Finding the Fourth Proportional to 1,381.59, 2,073.30 and 651.21

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Solution

The fourth proportional to 1,381.59, 2,073.30 and 651.21 is: 977.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.59 : 2,073.30 = 651.21 : x
  2. Step 2: Convert to fraction form
    1,381.59/2,073.30 = 651.21/x
  3. Step 3: Cross multiply
    1,381.59x = 2,073.30 × 651.21
  4. Step 4: Simplify right side
    1,381.59x = 1,350,150.44
  5. Step 5: Solve for x
    x = 1,350,150.44/1,381.59
  6. Step 6: Final answer
    x = 977.25

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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.