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Finding the Fourth Proportional to 86,902.80, 130,451.40 and 81,192.30

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Solution

The fourth proportional to 86,902.80, 130,451.40 and 81,192.30 is: 121,879.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,902.80 : 130,451.40 = 81,192.30 : x
  2. Step 2: Convert to fraction form
    86,902.80/130,451.40 = 81,192.30/x
  3. Step 3: Cross multiply
    86,902.80x = 130,451.40 × 81,192.30
  4. Step 4: Simplify right side
    86,902.80x = 10,591,649,204.22
  5. Step 5: Solve for x
    x = 10,591,649,204.22/86,902.80
  6. Step 6: Final answer
    x = 121,879.26

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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.