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Finding the Fourth Proportional to 81,689.20, 122,533.80 and 40,217.20

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Solution

The fourth proportional to 81,689.20, 122,533.80 and 40,217.20 is: 60,325.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,689.20 : 122,533.80 = 40,217.20 : x
  2. Step 2: Convert to fraction form
    81,689.20/122,533.80 = 40,217.20/x
  3. Step 3: Cross multiply
    81,689.20x = 122,533.80 × 40,217.20
  4. Step 4: Simplify right side
    81,689.20x = 4,927,966,341.36
  5. Step 5: Solve for x
    x = 4,927,966,341.36/81,689.20
  6. Step 6: Final answer
    x = 60,325.80

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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.