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Finding the Fourth Proportional to 98,600.80, 147,901.20 and 81,979.60

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Solution

The fourth proportional to 98,600.80, 147,901.20 and 81,979.60 is: 122,969.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,600.80 : 147,901.20 = 81,979.60 : x
  2. Step 2: Convert to fraction form
    98,600.80/147,901.20 = 81,979.60/x
  3. Step 3: Cross multiply
    98,600.80x = 147,901.20 × 81,979.60
  4. Step 4: Simplify right side
    98,600.80x = 12,124,881,215.52
  5. Step 5: Solve for x
    x = 12,124,881,215.52/98,600.80
  6. Step 6: Final answer
    x = 122,969.40

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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.