Home / 20,712.18-31,077.90-8,869.60

Finding the Fourth Proportional to 20,712.18, 31,077.90 and 8,869.60

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Solution

The fourth proportional to 20,712.18, 31,077.90 and 8,869.60 is: 13,308.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712.18 : 31,077.90 = 8,869.60 : x
  2. Step 2: Convert to fraction form
    20,712.18/31,077.90 = 8,869.60/x
  3. Step 3: Cross multiply
    20,712.18x = 31,077.90 × 8,869.60
  4. Step 4: Simplify right side
    20,712.18x = 275,648,541.84
  5. Step 5: Solve for x
    x = 275,648,541.84/20,712.18
  6. Step 6: Final answer
    x = 13,308.52

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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.