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Finding the Fourth Proportional to 81,175.80, 121,763.70 and 61,492.80

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Solution

The fourth proportional to 81,175.80, 121,763.70 and 61,492.80 is: 92,239.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,175.80 : 121,763.70 = 61,492.80 : x
  2. Step 2: Convert to fraction form
    81,175.80/121,763.70 = 61,492.80/x
  3. Step 3: Cross multiply
    81,175.80x = 121,763.70 × 61,492.80
  4. Step 4: Simplify right side
    81,175.80x = 7,487,590,851.36
  5. Step 5: Solve for x
    x = 7,487,590,851.36/81,175.80
  6. Step 6: Final answer
    x = 92,239.20

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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.