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Finding the Fourth Proportional to 927.15, 1,390.72 and 342.57

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Solution

The fourth proportional to 927.15, 1,390.72 and 342.57 is: 513.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.15 : 1,390.72 = 342.57 : x
  2. Step 2: Convert to fraction form
    927.15/1,390.72 = 342.57/x
  3. Step 3: Cross multiply
    927.15x = 1,390.72 × 342.57
  4. Step 4: Simplify right side
    927.15x = 476,418.95
  5. Step 5: Solve for x
    x = 476,418.95/927.15
  6. Step 6: Final answer
    x = 513.85

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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.