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Finding the Fourth Proportional to 1,042, 1,440 and 855.20

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Solution

The fourth proportional to 1,042, 1,440 and 855.20 is: 1,181.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042 : 1,440 = 855.20 : x
  2. Step 2: Convert to fraction form
    1,042/1,440 = 855.20/x
  3. Step 3: Cross multiply
    1,042x = 1,440 × 855.20
  4. Step 4: Simplify right side
    1,042x = 1,231,488
  5. Step 5: Solve for x
    x = 1,231,488/1,042
  6. Step 6: Final answer
    x = 1,181.85

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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.