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Finding the Fourth Proportional to 927.13, 1,390.70 and 277.90

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Solution

The fourth proportional to 927.13, 1,390.70 and 277.90 is: 416.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.13 : 1,390.70 = 277.90 : x
  2. Step 2: Convert to fraction form
    927.13/1,390.70 = 277.90/x
  3. Step 3: Cross multiply
    927.13x = 1,390.70 × 277.90
  4. Step 4: Simplify right side
    927.13x = 386,475.53
  5. Step 5: Solve for x
    x = 386,475.53/927.13
  6. Step 6: Final answer
    x = 416.85

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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.