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Finding the Fourth Proportional to 981.32, 1,471.07 and 425.67

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Solution

The fourth proportional to 981.32, 1,471.07 and 425.67 is: 638.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.32 : 1,471.07 = 425.67 : x
  2. Step 2: Convert to fraction form
    981.32/1,471.07 = 425.67/x
  3. Step 3: Cross multiply
    981.32x = 1,471.07 × 425.67
  4. Step 4: Simplify right side
    981.32x = 626,188.24
  5. Step 5: Solve for x
    x = 626,188.24/981.32
  6. Step 6: Final answer
    x = 638.11

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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.