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Finding the Fourth Proportional to 1,439.83, 2,158.12 and 709.91

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Solution

The fourth proportional to 1,439.83, 2,158.12 and 709.91 is: 1,064.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.83 : 2,158.12 = 709.91 : x
  2. Step 2: Convert to fraction form
    1,439.83/2,158.12 = 709.91/x
  3. Step 3: Cross multiply
    1,439.83x = 2,158.12 × 709.91
  4. Step 4: Simplify right side
    1,439.83x = 1,532,070.97
  5. Step 5: Solve for x
    x = 1,532,070.97/1,439.83
  6. Step 6: Final answer
    x = 1,064.06

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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.