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Finding the Fourth Proportional to 86,939.60, 130,409.40 and 81,064.40

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Solution

The fourth proportional to 86,939.60, 130,409.40 and 81,064.40 is: 121,596.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,939.60 : 130,409.40 = 81,064.40 : x
  2. Step 2: Convert to fraction form
    86,939.60/130,409.40 = 81,064.40/x
  3. Step 3: Cross multiply
    86,939.60x = 130,409.40 × 81,064.40
  4. Step 4: Simplify right side
    86,939.60x = 10,571,559,765.36
  5. Step 5: Solve for x
    x = 10,571,559,765.36/86,939.60
  6. Step 6: Final answer
    x = 121,596.60

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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.