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Finding the Fourth Proportional to 1,034.79, 1,427.03 and 661.12

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Solution

The fourth proportional to 1,034.79, 1,427.03 and 661.12 is: 911.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,034.79 : 1,427.03 = 661.12 : x
  2. Step 2: Convert to fraction form
    1,034.79/1,427.03 = 661.12/x
  3. Step 3: Cross multiply
    1,034.79x = 1,427.03 × 661.12
  4. Step 4: Simplify right side
    1,034.79x = 943,432.85
  5. Step 5: Solve for x
    x = 943,432.85/1,034.79
  6. Step 6: Final answer
    x = 911.72

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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.