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Finding the Fourth Proportional to 981.92, 1,470.50 and 520.10

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Solution

The fourth proportional to 981.92, 1,470.50 and 520.10 is: 778.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.92 : 1,470.50 = 520.10 : x
  2. Step 2: Convert to fraction form
    981.92/1,470.50 = 520.10/x
  3. Step 3: Cross multiply
    981.92x = 1,470.50 × 520.10
  4. Step 4: Simplify right side
    981.92x = 764,807.05
  5. Step 5: Solve for x
    x = 764,807.05/981.92
  6. Step 6: Final answer
    x = 778.89

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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.