Home / 20,931.60-31,368.24-15,731.40

Finding the Fourth Proportional to 20,931.60, 31,368.24 and 15,731.40

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Solution

The fourth proportional to 20,931.60, 31,368.24 and 15,731.40 is: 23,575.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.60 : 31,368.24 = 15,731.40 : x
  2. Step 2: Convert to fraction form
    20,931.60/31,368.24 = 15,731.40/x
  3. Step 3: Cross multiply
    20,931.60x = 31,368.24 × 15,731.40
  4. Step 4: Simplify right side
    20,931.60x = 493,466,330.74
  5. Step 5: Solve for x
    x = 493,466,330.74/20,931.60
  6. Step 6: Final answer
    x = 23,575.18

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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.