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Finding the Fourth Proportional to 1,239.90, 1,856.61 and 659.94

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Solution

The fourth proportional to 1,239.90, 1,856.61 and 659.94 is: 988.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.90 : 1,856.61 = 659.94 : x
  2. Step 2: Convert to fraction form
    1,239.90/1,856.61 = 659.94/x
  3. Step 3: Cross multiply
    1,239.90x = 1,856.61 × 659.94
  4. Step 4: Simplify right side
    1,239.90x = 1,225,251.20
  5. Step 5: Solve for x
    x = 1,225,251.20/1,239.90
  6. Step 6: Final answer
    x = 988.19

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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.