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Finding the Fourth Proportional to 82,707.20, 124,060.80 and 78,905.60

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Solution

The fourth proportional to 82,707.20, 124,060.80 and 78,905.60 is: 118,358.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,707.20 : 124,060.80 = 78,905.60 : x
  2. Step 2: Convert to fraction form
    82,707.20/124,060.80 = 78,905.60/x
  3. Step 3: Cross multiply
    82,707.20x = 124,060.80 × 78,905.60
  4. Step 4: Simplify right side
    82,707.20x = 9,789,091,860.48
  5. Step 5: Solve for x
    x = 9,789,091,860.48/82,707.20
  6. Step 6: Final answer
    x = 118,358.40

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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.