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Finding the Fourth Proportional to 81,216.60, 121,781.70 and 34,416.60

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Solution

The fourth proportional to 81,216.60, 121,781.70 and 34,416.60 is: 51,606.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,216.60 : 121,781.70 = 34,416.60 : x
  2. Step 2: Convert to fraction form
    81,216.60/121,781.70 = 34,416.60/x
  3. Step 3: Cross multiply
    81,216.60x = 121,781.70 × 34,416.60
  4. Step 4: Simplify right side
    81,216.60x = 4,191,312,056.22
  5. Step 5: Solve for x
    x = 4,191,312,056.22/81,216.60
  6. Step 6: Final answer
    x = 51,606.59

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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.