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Finding the Fourth Proportional to 86,169.30, 128,998.80 and 64,080.60

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Solution

The fourth proportional to 86,169.30, 128,998.80 and 64,080.60 is: 95,931.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,169.30 : 128,998.80 = 64,080.60 : x
  2. Step 2: Convert to fraction form
    86,169.30/128,998.80 = 64,080.60/x
  3. Step 3: Cross multiply
    86,169.30x = 128,998.80 × 64,080.60
  4. Step 4: Simplify right side
    86,169.30x = 8,266,320,503.28
  5. Step 5: Solve for x
    x = 8,266,320,503.28/86,169.30
  6. Step 6: Final answer
    x = 95,931.16

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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.