Home / 20,864.32-31,254.76-12,539.78

Finding the Fourth Proportional to 20,864.32, 31,254.76 and 12,539.78

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Solution

The fourth proportional to 20,864.32, 31,254.76 and 12,539.78 is: 18,784.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,864.32 : 31,254.76 = 12,539.78 : x
  2. Step 2: Convert to fraction form
    20,864.32/31,254.76 = 12,539.78/x
  3. Step 3: Cross multiply
    20,864.32x = 31,254.76 × 12,539.78
  4. Step 4: Simplify right side
    20,864.32x = 391,927,814.35
  5. Step 5: Solve for x
    x = 391,927,814.35/20,864.32
  6. Step 6: Final answer
    x = 18,784.60

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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.