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Finding the Fourth Proportional to 1,659.17, 2,487.40 and 781.25

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Solution

The fourth proportional to 1,659.17, 2,487.40 and 781.25 is: 1,171.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.17 : 2,487.40 = 781.25 : x
  2. Step 2: Convert to fraction form
    1,659.17/2,487.40 = 781.25/x
  3. Step 3: Cross multiply
    1,659.17x = 2,487.40 × 781.25
  4. Step 4: Simplify right side
    1,659.17x = 1,943,266.86
  5. Step 5: Solve for x
    x = 1,943,266.86/1,659.17
  6. Step 6: Final answer
    x = 1,171.23

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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.