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Finding the Fourth Proportional to 1,042.56, 1,438.77 and 711.14

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Solution

The fourth proportional to 1,042.56, 1,438.77 and 711.14 is: 981.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.56 : 1,438.77 = 711.14 : x
  2. Step 2: Convert to fraction form
    1,042.56/1,438.77 = 711.14/x
  3. Step 3: Cross multiply
    1,042.56x = 1,438.77 × 711.14
  4. Step 4: Simplify right side
    1,042.56x = 1,023,159.70
  5. Step 5: Solve for x
    x = 1,023,159.70/1,042.56
  6. Step 6: Final answer
    x = 981.39

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1.5x scale

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.