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Finding the Fourth Proportional to 916.85, 1,375.28 and 505.76

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Solution

The fourth proportional to 916.85, 1,375.28 and 505.76 is: 758.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.85 : 1,375.28 = 505.76 : x
  2. Step 2: Convert to fraction form
    916.85/1,375.28 = 505.76/x
  3. Step 3: Cross multiply
    916.85x = 1,375.28 × 505.76
  4. Step 4: Simplify right side
    916.85x = 695,561.84
  5. Step 5: Solve for x
    x = 695,561.84/916.85
  6. Step 6: Final answer
    x = 758.64

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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.