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Finding the Fourth Proportional to 85,428.80, 128,143.20 and 61,809.20

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Solution

The fourth proportional to 85,428.80, 128,143.20 and 61,809.20 is: 92,713.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,428.80 : 128,143.20 = 61,809.20 : x
  2. Step 2: Convert to fraction form
    85,428.80/128,143.20 = 61,809.20/x
  3. Step 3: Cross multiply
    85,428.80x = 128,143.20 × 61,809.20
  4. Step 4: Simplify right side
    85,428.80x = 7,920,428,677.44
  5. Step 5: Solve for x
    x = 7,920,428,677.44/85,428.80
  6. Step 6: Final answer
    x = 92,713.80

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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.