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Finding the Fourth Proportional to 85,515.80, 128,273.70 and 69,769.40

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Solution

The fourth proportional to 85,515.80, 128,273.70 and 69,769.40 is: 104,654.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,515.80 : 128,273.70 = 69,769.40 : x
  2. Step 2: Convert to fraction form
    85,515.80/128,273.70 = 69,769.40/x
  3. Step 3: Cross multiply
    85,515.80x = 128,273.70 × 69,769.40
  4. Step 4: Simplify right side
    85,515.80x = 8,949,579,084.78
  5. Step 5: Solve for x
    x = 8,949,579,084.78/85,515.80
  6. Step 6: Final answer
    x = 104,654.10

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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.