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Finding the Fourth Proportional to 100,988.80, 151,310.40 and 64,009.60

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Solution

The fourth proportional to 100,988.80, 151,310.40 and 64,009.60 is: 95,904.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,988.80 : 151,310.40 = 64,009.60 : x
  2. Step 2: Convert to fraction form
    100,988.80/151,310.40 = 64,009.60/x
  3. Step 3: Cross multiply
    100,988.80x = 151,310.40 × 64,009.60
  4. Step 4: Simplify right side
    100,988.80x = 9,685,318,179.84
  5. Step 5: Solve for x
    x = 9,685,318,179.84/100,988.80
  6. Step 6: Final answer
    x = 95,904.87

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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.