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Finding the Fourth Proportional to 1,285.91, 1,930.01 and 981.56

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Solution

The fourth proportional to 1,285.91, 1,930.01 and 981.56 is: 1,473.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.91 : 1,930.01 = 981.56 : x
  2. Step 2: Convert to fraction form
    1,285.91/1,930.01 = 981.56/x
  3. Step 3: Cross multiply
    1,285.91x = 1,930.01 × 981.56
  4. Step 4: Simplify right side
    1,285.91x = 1,894,420.62
  5. Step 5: Solve for x
    x = 1,894,420.62/1,285.91
  6. Step 6: Final answer
    x = 1,473.21

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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.