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Finding the Fourth Proportional to 1,531.20, 2,113 and 867.90

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Solution

The fourth proportional to 1,531.20, 2,113 and 867.90 is: 1,197.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.20 : 2,113 = 867.90 : x
  2. Step 2: Convert to fraction form
    1,531.20/2,113 = 867.90/x
  3. Step 3: Cross multiply
    1,531.20x = 2,113 × 867.90
  4. Step 4: Simplify right side
    1,531.20x = 1,833,872.70
  5. Step 5: Solve for x
    x = 1,833,872.70/1,531.20
  6. Step 6: Final answer
    x = 1,197.67

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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.