Home / 21,138.60-31,678.74-15,938.76

Finding the Fourth Proportional to 21,138.60, 31,678.74 and 15,938.76

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Solution

The fourth proportional to 21,138.60, 31,678.74 and 15,938.76 is: 23,886.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.60 : 31,678.74 = 15,938.76 : x
  2. Step 2: Convert to fraction form
    21,138.60/31,678.74 = 15,938.76/x
  3. Step 3: Cross multiply
    21,138.60x = 31,678.74 × 15,938.76
  4. Step 4: Simplify right side
    21,138.60x = 504,919,833.96
  5. Step 5: Solve for x
    x = 504,919,833.96/21,138.60
  6. Step 6: Final answer
    x = 23,886.15

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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.