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Finding the Fourth Proportional to 1,280.34, 1,917.90 and 972.54

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Solution

The fourth proportional to 1,280.34, 1,917.90 and 972.54 is: 1,456.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.34 : 1,917.90 = 972.54 : x
  2. Step 2: Convert to fraction form
    1,280.34/1,917.90 = 972.54/x
  3. Step 3: Cross multiply
    1,280.34x = 1,917.90 × 972.54
  4. Step 4: Simplify right side
    1,280.34x = 1,865,234.47
  5. Step 5: Solve for x
    x = 1,865,234.47/1,280.34
  6. Step 6: Final answer
    x = 1,456.83

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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.