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Finding the Fourth Proportional to 81,212.10, 121,818.15 and 34,458.90

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Solution

The fourth proportional to 81,212.10, 121,818.15 and 34,458.90 is: 51,688.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,212.10 : 121,818.15 = 34,458.90 : x
  2. Step 2: Convert to fraction form
    81,212.10/121,818.15 = 34,458.90/x
  3. Step 3: Cross multiply
    81,212.10x = 121,818.15 × 34,458.90
  4. Step 4: Simplify right side
    81,212.10x = 4,197,719,449.04
  5. Step 5: Solve for x
    x = 4,197,719,449.04/81,212.10
  6. Step 6: Final answer
    x = 51,688.35

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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.