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Finding the Fourth Proportional to 86,672.70, 130,009.05 and 80,840.70

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Solution

The fourth proportional to 86,672.70, 130,009.05 and 80,840.70 is: 121,261.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,672.70 : 130,009.05 = 80,840.70 : x
  2. Step 2: Convert to fraction form
    86,672.70/130,009.05 = 80,840.70/x
  3. Step 3: Cross multiply
    86,672.70x = 130,009.05 × 80,840.70
  4. Step 4: Simplify right side
    86,672.70x = 10,510,022,608.34
  5. Step 5: Solve for x
    x = 10,510,022,608.34/86,672.70
  6. Step 6: Final answer
    x = 121,261.05

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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.