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Finding the Fourth Proportional to 1,239.53, 1,859.46 and 654.55

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Solution

The fourth proportional to 1,239.53, 1,859.46 and 654.55 is: 981.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.53 : 1,859.46 = 654.55 : x
  2. Step 2: Convert to fraction form
    1,239.53/1,859.46 = 654.55/x
  3. Step 3: Cross multiply
    1,239.53x = 1,859.46 × 654.55
  4. Step 4: Simplify right side
    1,239.53x = 1,217,113.22
  5. Step 5: Solve for x
    x = 1,217,113.22/1,239.53
  6. Step 6: Final answer
    x = 981.92

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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.