Home / 20,989.12-31,488.48-7,138.24

Finding the Fourth Proportional to 20,989.12, 31,488.48 and 7,138.24

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Solution

The fourth proportional to 20,989.12, 31,488.48 and 7,138.24 is: 10,708.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.12 : 31,488.48 = 7,138.24 : x
  2. Step 2: Convert to fraction form
    20,989.12/31,488.48 = 7,138.24/x
  3. Step 3: Cross multiply
    20,989.12x = 31,488.48 × 7,138.24
  4. Step 4: Simplify right side
    20,989.12x = 224,772,327.48
  5. Step 5: Solve for x
    x = 224,772,327.48/20,989.12
  6. Step 6: Final answer
    x = 10,708.99

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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.