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Finding the Fourth Proportional to 20,656.78, 30,986.70 and 5,866.90

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Solution

The fourth proportional to 20,656.78, 30,986.70 and 5,866.90 is: 8,800.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,656.78 : 30,986.70 = 5,866.90 : x
  2. Step 2: Convert to fraction form
    20,656.78/30,986.70 = 5,866.90/x
  3. Step 3: Cross multiply
    20,656.78x = 30,986.70 × 5,866.90
  4. Step 4: Simplify right side
    20,656.78x = 181,795,870.23
  5. Step 5: Solve for x
    x = 181,795,870.23/20,656.78
  6. Step 6: Final answer
    x = 8,800.78

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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.