Home / 20,220.78-30,318.02-9,690.52

Finding the Fourth Proportional to 20,220.78, 30,318.02 and 9,690.52

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Solution

The fourth proportional to 20,220.78, 30,318.02 and 9,690.52 is: 14,529.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,220.78 : 30,318.02 = 9,690.52 : x
  2. Step 2: Convert to fraction form
    20,220.78/30,318.02 = 9,690.52/x
  3. Step 3: Cross multiply
    20,220.78x = 30,318.02 × 9,690.52
  4. Step 4: Simplify right side
    20,220.78x = 293,797,379.17
  5. Step 5: Solve for x
    x = 293,797,379.17/20,220.78
  6. Step 6: Final answer
    x = 14,529.48

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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.