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Finding the Fourth Proportional to 85,959.20, 128,938.80 and 67,296.80

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Solution

The fourth proportional to 85,959.20, 128,938.80 and 67,296.80 is: 100,945.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,959.20 : 128,938.80 = 67,296.80 : x
  2. Step 2: Convert to fraction form
    85,959.20/128,938.80 = 67,296.80/x
  3. Step 3: Cross multiply
    85,959.20x = 128,938.80 × 67,296.80
  4. Step 4: Simplify right side
    85,959.20x = 8,677,168,635.84
  5. Step 5: Solve for x
    x = 8,677,168,635.84/85,959.20
  6. Step 6: Final answer
    x = 100,945.20

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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.