Home / 21,278.60-31,870.36-15,421.76

Finding the Fourth Proportional to 21,278.60, 31,870.36 and 15,421.76

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Solution

The fourth proportional to 21,278.60, 31,870.36 and 15,421.76 is: 23,098.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.60 : 31,870.36 = 15,421.76 : x
  2. Step 2: Convert to fraction form
    21,278.60/31,870.36 = 15,421.76/x
  3. Step 3: Cross multiply
    21,278.60x = 31,870.36 × 15,421.76
  4. Step 4: Simplify right side
    21,278.60x = 491,497,043.03
  5. Step 5: Solve for x
    x = 491,497,043.03/21,278.60
  6. Step 6: Final answer
    x = 23,098.19

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1.5x scale

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.