Home / 21,278.60-31,931.12-8,132.28

Finding the Fourth Proportional to 21,278.60, 31,931.12 and 8,132.28

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Solution

The fourth proportional to 21,278.60, 31,931.12 and 8,132.28 is: 12,203.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.60 : 31,931.12 = 8,132.28 : x
  2. Step 2: Convert to fraction form
    21,278.60/31,931.12 = 8,132.28/x
  3. Step 3: Cross multiply
    21,278.60x = 31,931.12 × 8,132.28
  4. Step 4: Simplify right side
    21,278.60x = 259,672,808.55
  5. Step 5: Solve for x
    x = 259,672,808.55/21,278.60
  6. Step 6: Final answer
    x = 12,203.47

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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.