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Finding the Fourth Proportional to 983.86, 1,358.31 and 874.52

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Solution

The fourth proportional to 983.86, 1,358.31 and 874.52 is: 1,207.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.86 : 1,358.31 = 874.52 : x
  2. Step 2: Convert to fraction form
    983.86/1,358.31 = 874.52/x
  3. Step 3: Cross multiply
    983.86x = 1,358.31 × 874.52
  4. Step 4: Simplify right side
    983.86x = 1,187,869.26
  5. Step 5: Solve for x
    x = 1,187,869.26/983.86
  6. Step 6: Final answer
    x = 1,207.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.