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Finding the Fourth Proportional to 1,000.42, 1,381.20 and 737.98

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Solution

The fourth proportional to 1,000.42, 1,381.20 and 737.98 is: 1,018.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.42 : 1,381.20 = 737.98 : x
  2. Step 2: Convert to fraction form
    1,000.42/1,381.20 = 737.98/x
  3. Step 3: Cross multiply
    1,000.42x = 1,381.20 × 737.98
  4. Step 4: Simplify right side
    1,000.42x = 1,019,297.98
  5. Step 5: Solve for x
    x = 1,019,297.98/1,000.42
  6. Step 6: Final answer
    x = 1,018.87

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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.