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Finding the Fourth Proportional to 981.31, 1,471.80 and 364.87

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Solution

The fourth proportional to 981.31, 1,471.80 and 364.87 is: 547.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.31 : 1,471.80 = 364.87 : x
  2. Step 2: Convert to fraction form
    981.31/1,471.80 = 364.87/x
  3. Step 3: Cross multiply
    981.31x = 1,471.80 × 364.87
  4. Step 4: Simplify right side
    981.31x = 537,015.67
  5. Step 5: Solve for x
    x = 537,015.67/981.31
  6. Step 6: Final answer
    x = 547.24

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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.