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Finding the Fourth Proportional to 927.16, 1,278.66 and 664.72

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Solution

The fourth proportional to 927.16, 1,278.66 and 664.72 is: 916.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.16 : 1,278.66 = 664.72 : x
  2. Step 2: Convert to fraction form
    927.16/1,278.66 = 664.72/x
  3. Step 3: Cross multiply
    927.16x = 1,278.66 × 664.72
  4. Step 4: Simplify right side
    927.16x = 849,950.88
  5. Step 5: Solve for x
    x = 849,950.88/927.16
  6. Step 6: Final answer
    x = 916.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.