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Finding the Fourth Proportional to 81,196.80, 121,814.40 and 25,792.80

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Solution

The fourth proportional to 81,196.80, 121,814.40 and 25,792.80 is: 38,695.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,196.80 : 121,814.40 = 25,792.80 : x
  2. Step 2: Convert to fraction form
    81,196.80/121,814.40 = 25,792.80/x
  3. Step 3: Cross multiply
    81,196.80x = 121,814.40 × 25,792.80
  4. Step 4: Simplify right side
    81,196.80x = 3,141,934,456.32
  5. Step 5: Solve for x
    x = 3,141,934,456.32/81,196.80
  6. Step 6: Final answer
    x = 38,695.30

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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.