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Finding the Fourth Proportional to 1,239.21, 1,859.13 and 874.71

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Solution

The fourth proportional to 1,239.21, 1,859.13 and 874.71 is: 1,312.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.21 : 1,859.13 = 874.71 : x
  2. Step 2: Convert to fraction form
    1,239.21/1,859.13 = 874.71/x
  3. Step 3: Cross multiply
    1,239.21x = 1,859.13 × 874.71
  4. Step 4: Simplify right side
    1,239.21x = 1,626,197.42
  5. Step 5: Solve for x
    x = 1,626,197.42/1,239.21
  6. Step 6: Final answer
    x = 1,312.29

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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.