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Finding the Fourth Proportional to 81,211.60, 121,817.40 and 34,458.40

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Solution

The fourth proportional to 81,211.60, 121,817.40 and 34,458.40 is: 51,687.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,211.60 : 121,817.40 = 34,458.40 : x
  2. Step 2: Convert to fraction form
    81,211.60/121,817.40 = 34,458.40/x
  3. Step 3: Cross multiply
    81,211.60x = 121,817.40 × 34,458.40
  4. Step 4: Simplify right side
    81,211.60x = 4,197,632,696.16
  5. Step 5: Solve for x
    x = 4,197,632,696.16/81,211.60
  6. Step 6: Final answer
    x = 51,687.60

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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.