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Finding the Fourth Proportional to 981.96, 1,465.92 and 947.80

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Solution

The fourth proportional to 981.96, 1,465.92 and 947.80 is: 1,414.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.96 : 1,465.92 = 947.80 : x
  2. Step 2: Convert to fraction form
    981.96/1,465.92 = 947.80/x
  3. Step 3: Cross multiply
    981.96x = 1,465.92 × 947.80
  4. Step 4: Simplify right side
    981.96x = 1,389,398.98
  5. Step 5: Solve for x
    x = 1,389,398.98/981.96
  6. Step 6: Final answer
    x = 1,414.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.