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Finding the Fourth Proportional to 25,402.95, 38,127.80 and 12,931.88

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Solution

The fourth proportional to 25,402.95, 38,127.80 and 12,931.88 is: 19,409.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,402.95 : 38,127.80 = 12,931.88 : x
  2. Step 2: Convert to fraction form
    25,402.95/38,127.80 = 12,931.88/x
  3. Step 3: Cross multiply
    25,402.95x = 38,127.80 × 12,931.88
  4. Step 4: Simplify right side
    25,402.95x = 493,063,975.95
  5. Step 5: Solve for x
    x = 493,063,975.95/25,402.95
  6. Step 6: Final answer
    x = 19,409.71

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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.