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Finding the Fourth Proportional to 1,658.93, 2,487.02 and 781.00

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Solution

The fourth proportional to 1,658.93, 2,487.02 and 781.00 is: 1,170.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,658.93 : 2,487.02 = 781.00 : x
  2. Step 2: Convert to fraction form
    1,658.93/2,487.02 = 781.00/x
  3. Step 3: Cross multiply
    1,658.93x = 2,487.02 × 781.00
  4. Step 4: Simplify right side
    1,658.93x = 1,942,346.28
  5. Step 5: Solve for x
    x = 1,942,346.28/1,658.93
  6. Step 6: Final answer
    x = 1,170.84

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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.