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Finding the Fourth Proportional to 981.59, 1,473.17 and 920.00

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Solution

The fourth proportional to 981.59, 1,473.17 and 920.00 is: 1,380.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.59 : 1,473.17 = 920.00 : x
  2. Step 2: Convert to fraction form
    981.59/1,473.17 = 920.00/x
  3. Step 3: Cross multiply
    981.59x = 1,473.17 × 920.00
  4. Step 4: Simplify right side
    981.59x = 1,355,315.48
  5. Step 5: Solve for x
    x = 1,355,315.48/981.59
  6. Step 6: Final answer
    x = 1,380.74

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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.