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Finding the Fourth Proportional to 1,439.88, 2,160.05 and 709.53

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Solution

The fourth proportional to 1,439.88, 2,160.05 and 709.53 is: 1,064.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.88 : 2,160.05 = 709.53 : x
  2. Step 2: Convert to fraction form
    1,439.88/2,160.05 = 709.53/x
  3. Step 3: Cross multiply
    1,439.88x = 2,160.05 × 709.53
  4. Step 4: Simplify right side
    1,439.88x = 1,532,620.28
  5. Step 5: Solve for x
    x = 1,532,620.28/1,439.88
  6. Step 6: Final answer
    x = 1,064.41

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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.