Home / 20,991.20-31,486.80-7,140.24

Finding the Fourth Proportional to 20,991.20, 31,486.80 and 7,140.24

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Solution

The fourth proportional to 20,991.20, 31,486.80 and 7,140.24 is: 10,710.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.20 : 31,486.80 = 7,140.24 : x
  2. Step 2: Convert to fraction form
    20,991.20/31,486.80 = 7,140.24/x
  3. Step 3: Cross multiply
    20,991.20x = 31,486.80 × 7,140.24
  4. Step 4: Simplify right side
    20,991.20x = 224,823,308.83
  5. Step 5: Solve for x
    x = 224,823,308.83/20,991.20
  6. Step 6: Final answer
    x = 10,710.36

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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.