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Finding the Fourth Proportional to 126,603.20, 189,904.80 and 81,988.40

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Solution

The fourth proportional to 126,603.20, 189,904.80 and 81,988.40 is: 122,982.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,603.20 : 189,904.80 = 81,988.40 : x
  2. Step 2: Convert to fraction form
    126,603.20/189,904.80 = 81,988.40/x
  3. Step 3: Cross multiply
    126,603.20x = 189,904.80 × 81,988.40
  4. Step 4: Simplify right side
    126,603.20x = 15,569,990,704.32
  5. Step 5: Solve for x
    x = 15,569,990,704.32/126,603.20
  6. Step 6: Final answer
    x = 122,982.60

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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.