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Finding the Fourth Proportional to 1,042.51, 1,439.88 and 821.18

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Solution

The fourth proportional to 1,042.51, 1,439.88 and 821.18 is: 1,134.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.51 : 1,439.88 = 821.18 : x
  2. Step 2: Convert to fraction form
    1,042.51/1,439.88 = 821.18/x
  3. Step 3: Cross multiply
    1,042.51x = 1,439.88 × 821.18
  4. Step 4: Simplify right side
    1,042.51x = 1,182,400.66
  5. Step 5: Solve for x
    x = 1,182,400.66/1,042.51
  6. Step 6: Final answer
    x = 1,134.19

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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.