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Finding the Fourth Proportional to 1,281.56, 1,923.28 and 871.12

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Solution

The fourth proportional to 1,281.56, 1,923.28 and 871.12 is: 1,307.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.56 : 1,923.28 = 871.12 : x
  2. Step 2: Convert to fraction form
    1,281.56/1,923.28 = 871.12/x
  3. Step 3: Cross multiply
    1,281.56x = 1,923.28 × 871.12
  4. Step 4: Simplify right side
    1,281.56x = 1,675,407.67
  5. Step 5: Solve for x
    x = 1,675,407.67/1,281.56
  6. Step 6: Final answer
    x = 1,307.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.