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Finding the Fourth Proportional to 86,685.80, 130,028.70 and 81,501.80

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Solution

The fourth proportional to 86,685.80, 130,028.70 and 81,501.80 is: 122,252.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,685.80 : 130,028.70 = 81,501.80 : x
  2. Step 2: Convert to fraction form
    86,685.80/130,028.70 = 81,501.80/x
  3. Step 3: Cross multiply
    86,685.80x = 130,028.70 × 81,501.80
  4. Step 4: Simplify right side
    86,685.80x = 10,597,573,101.66
  5. Step 5: Solve for x
    x = 10,597,573,101.66/86,685.80
  6. Step 6: Final answer
    x = 122,252.70

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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.