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Finding the Fourth Proportional to 983.28, 1,358.28 and 865.08

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Solution

The fourth proportional to 983.28, 1,358.28 and 865.08 is: 1,195.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.28 : 1,358.28 = 865.08 : x
  2. Step 2: Convert to fraction form
    983.28/1,358.28 = 865.08/x
  3. Step 3: Cross multiply
    983.28x = 1,358.28 × 865.08
  4. Step 4: Simplify right side
    983.28x = 1,175,020.86
  5. Step 5: Solve for x
    x = 1,175,020.86/983.28
  6. Step 6: Final answer
    x = 1,195.00

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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.