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Finding the Fourth Proportional to 981.95, 1,472.96 and 388.95

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Solution

The fourth proportional to 981.95, 1,472.96 and 388.95 is: 583.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.95 : 1,472.96 = 388.95 : x
  2. Step 2: Convert to fraction form
    981.95/1,472.96 = 388.95/x
  3. Step 3: Cross multiply
    981.95x = 1,472.96 × 388.95
  4. Step 4: Simplify right side
    981.95x = 572,905.85
  5. Step 5: Solve for x
    x = 572,905.85/981.95
  6. Step 6: Final answer
    x = 583.44

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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.