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Finding the Fourth Proportional to 1,010.12, 1,393.34 and 885.78

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Solution

The fourth proportional to 1,010.12, 1,393.34 and 885.78 is: 1,221.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.12 : 1,393.34 = 885.78 : x
  2. Step 2: Convert to fraction form
    1,010.12/1,393.34 = 885.78/x
  3. Step 3: Cross multiply
    1,010.12x = 1,393.34 × 885.78
  4. Step 4: Simplify right side
    1,010.12x = 1,234,188.28
  5. Step 5: Solve for x
    x = 1,234,188.28/1,010.12
  6. Step 6: Final answer
    x = 1,221.83

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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.