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Finding the Fourth Proportional to 121,715.60, 182,573.40 and 71,819.60

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Solution

The fourth proportional to 121,715.60, 182,573.40 and 71,819.60 is: 107,729.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,715.60 : 182,573.40 = 71,819.60 : x
  2. Step 2: Convert to fraction form
    121,715.60/182,573.40 = 71,819.60/x
  3. Step 3: Cross multiply
    121,715.60x = 182,573.40 × 71,819.60
  4. Step 4: Simplify right side
    121,715.60x = 13,112,348,558.64
  5. Step 5: Solve for x
    x = 13,112,348,558.64/121,715.60
  6. Step 6: Final answer
    x = 107,729.40

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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.