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Finding the Fourth Proportional to 983.52, 1,358.64 and 688.72

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Solution

The fourth proportional to 983.52, 1,358.64 and 688.72 is: 951.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.52 : 1,358.64 = 688.72 : x
  2. Step 2: Convert to fraction form
    983.52/1,358.64 = 688.72/x
  3. Step 3: Cross multiply
    983.52x = 1,358.64 × 688.72
  4. Step 4: Simplify right side
    983.52x = 935,722.54
  5. Step 5: Solve for x
    x = 935,722.54/983.52
  6. Step 6: Final answer
    x = 951.40

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1.5x scale

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.