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Finding the Fourth Proportional to 1,285.45, 1,930.20 and 876.40

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Solution

The fourth proportional to 1,285.45, 1,930.20 and 876.40 is: 1,315.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.45 : 1,930.20 = 876.40 : x
  2. Step 2: Convert to fraction form
    1,285.45/1,930.20 = 876.40/x
  3. Step 3: Cross multiply
    1,285.45x = 1,930.20 × 876.40
  4. Step 4: Simplify right side
    1,285.45x = 1,691,627.28
  5. Step 5: Solve for x
    x = 1,691,627.28/1,285.45
  6. Step 6: Final answer
    x = 1,315.98

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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.