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Finding the Fourth Proportional to 118,711.80, 178,010.10 and 66,065.40

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Solution

The fourth proportional to 118,711.80, 178,010.10 and 66,065.40 is: 99,066.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,711.80 : 178,010.10 = 66,065.40 : x
  2. Step 2: Convert to fraction form
    118,711.80/178,010.10 = 66,065.40/x
  3. Step 3: Cross multiply
    118,711.80x = 178,010.10 × 66,065.40
  4. Step 4: Simplify right side
    118,711.80x = 11,760,308,460.54
  5. Step 5: Solve for x
    x = 11,760,308,460.54/118,711.80
  6. Step 6: Final answer
    x = 99,066.04

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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.