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Finding the Fourth Proportional to 118,720.89, 178,086.80 and 66,090.74

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Solution

The fourth proportional to 118,720.89, 178,086.80 and 66,090.74 is: 99,139.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,720.89 : 178,086.80 = 66,090.74 : x
  2. Step 2: Convert to fraction form
    118,720.89/178,086.80 = 66,090.74/x
  3. Step 3: Cross multiply
    118,720.89x = 178,086.80 × 66,090.74
  4. Step 4: Simplify right side
    118,720.89x = 11,769,887,671.02
  5. Step 5: Solve for x
    x = 11,769,887,671.02/118,720.89
  6. Step 6: Final answer
    x = 99,139.15

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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.