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Finding the Fourth Proportional to 1,239.64, 1,859.16 and 361.96

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Solution

The fourth proportional to 1,239.64, 1,859.16 and 361.96 is: 542.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.64 : 1,859.16 = 361.96 : x
  2. Step 2: Convert to fraction form
    1,239.64/1,859.16 = 361.96/x
  3. Step 3: Cross multiply
    1,239.64x = 1,859.16 × 361.96
  4. Step 4: Simplify right side
    1,239.64x = 672,941.55
  5. Step 5: Solve for x
    x = 672,941.55/1,239.64
  6. Step 6: Final answer
    x = 542.85

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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.