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Finding the Fourth Proportional to 981.81, 1,472.40 and 519.50

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Solution

The fourth proportional to 981.81, 1,472.40 and 519.50 is: 779.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.81 : 1,472.40 = 519.50 : x
  2. Step 2: Convert to fraction form
    981.81/1,472.40 = 519.50/x
  3. Step 3: Cross multiply
    981.81x = 1,472.40 × 519.50
  4. Step 4: Simplify right side
    981.81x = 764,904.44
  5. Step 5: Solve for x
    x = 764,904.44/981.81
  6. Step 6: Final answer
    x = 779.08

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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.