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Finding the Fourth Proportional to 923.56, 1,385.86 and 916.68

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Solution

The fourth proportional to 923.56, 1,385.86 and 916.68 is: 1,375.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.56 : 1,385.86 = 916.68 : x
  2. Step 2: Convert to fraction form
    923.56/1,385.86 = 916.68/x
  3. Step 3: Cross multiply
    923.56x = 1,385.86 × 916.68
  4. Step 4: Simplify right side
    923.56x = 1,270,390.14
  5. Step 5: Solve for x
    x = 1,270,390.14/923.56
  6. Step 6: Final answer
    x = 1,375.54

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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.