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Finding the Fourth Proportional to 1,071.40, 1,486.10 and 1,042.95

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Solution

The fourth proportional to 1,071.40, 1,486.10 and 1,042.95 is: 1,446.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.40 : 1,486.10 = 1,042.95 : x
  2. Step 2: Convert to fraction form
    1,071.40/1,486.10 = 1,042.95/x
  3. Step 3: Cross multiply
    1,071.40x = 1,486.10 × 1,042.95
  4. Step 4: Simplify right side
    1,071.40x = 1,549,922.78
  5. Step 5: Solve for x
    x = 1,549,922.78/1,071.40
  6. Step 6: Final answer
    x = 1,446.63

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.