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Finding the Fourth Proportional to 85,721.80, 128,218.20 and 76,900.90

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Solution

The fourth proportional to 85,721.80, 128,218.20 and 76,900.90 is: 115,024.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,721.80 : 128,218.20 = 76,900.90 : x
  2. Step 2: Convert to fraction form
    85,721.80/128,218.20 = 76,900.90/x
  3. Step 3: Cross multiply
    85,721.80x = 128,218.20 × 76,900.90
  4. Step 4: Simplify right side
    85,721.80x = 9,860,094,976.38
  5. Step 5: Solve for x
    x = 9,860,094,976.38/85,721.80
  6. Step 6: Final answer
    x = 115,024.36

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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.