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Finding the Fourth Proportional to 927.16, 1,389.80 and 618.24

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Solution

The fourth proportional to 927.16, 1,389.80 and 618.24 is: 926.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.16 : 1,389.80 = 618.24 : x
  2. Step 2: Convert to fraction form
    927.16/1,389.80 = 618.24/x
  3. Step 3: Cross multiply
    927.16x = 1,389.80 × 618.24
  4. Step 4: Simplify right side
    927.16x = 859,229.95
  5. Step 5: Solve for x
    x = 859,229.95/927.16
  6. Step 6: Final answer
    x = 926.73

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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.