Home / 20,917.60-31,372.80-7,763.20

Finding the Fourth Proportional to 20,917.60, 31,372.80 and 7,763.20

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Solution

The fourth proportional to 20,917.60, 31,372.80 and 7,763.20 is: 11,643.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.60 : 31,372.80 = 7,763.20 : x
  2. Step 2: Convert to fraction form
    20,917.60/31,372.80 = 7,763.20/x
  3. Step 3: Cross multiply
    20,917.60x = 31,372.80 × 7,763.20
  4. Step 4: Simplify right side
    20,917.60x = 243,553,320.96
  5. Step 5: Solve for x
    x = 243,553,320.96/20,917.60
  6. Step 6: Final answer
    x = 11,643.46

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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.