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Finding the Fourth Proportional to 127,980.80, 191,971.20 and 85,990.40

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Solution

The fourth proportional to 127,980.80, 191,971.20 and 85,990.40 is: 128,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,980.80 : 191,971.20 = 85,990.40 : x
  2. Step 2: Convert to fraction form
    127,980.80/191,971.20 = 85,990.40/x
  3. Step 3: Cross multiply
    127,980.80x = 191,971.20 × 85,990.40
  4. Step 4: Simplify right side
    127,980.80x = 16,507,680,276.48
  5. Step 5: Solve for x
    x = 16,507,680,276.48/127,980.80
  6. Step 6: Final answer
    x = 128,985.60

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Similar ratio
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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.