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Finding the Fourth Proportional to 1,239.13, 1,859.85 and 654.56

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Solution

The fourth proportional to 1,239.13, 1,859.85 and 654.56 is: 982.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.13 : 1,859.85 = 654.56 : x
  2. Step 2: Convert to fraction form
    1,239.13/1,859.85 = 654.56/x
  3. Step 3: Cross multiply
    1,239.13x = 1,859.85 × 654.56
  4. Step 4: Simplify right side
    1,239.13x = 1,217,388.07
  5. Step 5: Solve for x
    x = 1,217,388.07/1,239.13
  6. Step 6: Final answer
    x = 982.45

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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.