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Finding the Fourth Proportional to 918.32, 1,380.46 and 737.70

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Solution

The fourth proportional to 918.32, 1,380.46 and 737.70 is: 1,108.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.32 : 1,380.46 = 737.70 : x
  2. Step 2: Convert to fraction form
    918.32/1,380.46 = 737.70/x
  3. Step 3: Cross multiply
    918.32x = 1,380.46 × 737.70
  4. Step 4: Simplify right side
    918.32x = 1,018,365.34
  5. Step 5: Solve for x
    x = 1,018,365.34/918.32
  6. Step 6: Final answer
    x = 1,108.94

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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.