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Finding the Fourth Proportional to 923.30, 1,377.72 and 917.90

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Solution

The fourth proportional to 923.30, 1,377.72 and 917.90 is: 1,369.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.30 : 1,377.72 = 917.90 : x
  2. Step 2: Convert to fraction form
    923.30/1,377.72 = 917.90/x
  3. Step 3: Cross multiply
    923.30x = 1,377.72 × 917.90
  4. Step 4: Simplify right side
    923.30x = 1,264,604.60
  5. Step 5: Solve for x
    x = 1,264,604.60/923.30
  6. Step 6: Final answer
    x = 1,369.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.