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Finding the Fourth Proportional to 118,711.20, 178,066.80 and 105,808.80

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Solution

The fourth proportional to 118,711.20, 178,066.80 and 105,808.80 is: 158,713.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,711.20 : 178,066.80 = 105,808.80 : x
  2. Step 2: Convert to fraction form
    118,711.20/178,066.80 = 105,808.80/x
  3. Step 3: Cross multiply
    118,711.20x = 178,066.80 × 105,808.80
  4. Step 4: Simplify right side
    118,711.20x = 18,841,034,427.84
  5. Step 5: Solve for x
    x = 18,841,034,427.84/118,711.20
  6. Step 6: Final answer
    x = 158,713.20

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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.