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Finding the Fourth Proportional to 86,998.80, 130,595.40 and 81,288.30

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Solution

The fourth proportional to 86,998.80, 130,595.40 and 81,288.30 is: 122,023.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,998.80 : 130,595.40 = 81,288.30 : x
  2. Step 2: Convert to fraction form
    86,998.80/130,595.40 = 81,288.30/x
  3. Step 3: Cross multiply
    86,998.80x = 130,595.40 × 81,288.30
  4. Step 4: Simplify right side
    86,998.80x = 10,615,878,053.82
  5. Step 5: Solve for x
    x = 10,615,878,053.82/86,998.80
  6. Step 6: Final answer
    x = 122,023.27

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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.