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Finding the Fourth Proportional to 85,973.20, 128,959.80 and 67,310.80

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Solution

The fourth proportional to 85,973.20, 128,959.80 and 67,310.80 is: 100,966.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,973.20 : 128,959.80 = 67,310.80 : x
  2. Step 2: Convert to fraction form
    85,973.20/128,959.80 = 67,310.80/x
  3. Step 3: Cross multiply
    85,973.20x = 128,959.80 × 67,310.80
  4. Step 4: Simplify right side
    85,973.20x = 8,680,387,305.84
  5. Step 5: Solve for x
    x = 8,680,387,305.84/85,973.20
  6. Step 6: Final answer
    x = 100,966.20

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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.