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Finding the Fourth Proportional to 1,239.33, 1,857.02 and 654.31

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Solution

The fourth proportional to 1,239.33, 1,857.02 and 654.31 is: 980.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.33 : 1,857.02 = 654.31 : x
  2. Step 2: Convert to fraction form
    1,239.33/1,857.02 = 654.31/x
  3. Step 3: Cross multiply
    1,239.33x = 1,857.02 × 654.31
  4. Step 4: Simplify right side
    1,239.33x = 1,215,068.39
  5. Step 5: Solve for x
    x = 1,215,068.39/1,239.33
  6. Step 6: Final answer
    x = 980.42

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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.