Home / 20,972.50-31,458.75-5,390.13

Finding the Fourth Proportional to 20,972.50, 31,458.75 and 5,390.13

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Solution

The fourth proportional to 20,972.50, 31,458.75 and 5,390.13 is: 8,085.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.50 : 31,458.75 = 5,390.13 : x
  2. Step 2: Convert to fraction form
    20,972.50/31,458.75 = 5,390.13/x
  3. Step 3: Cross multiply
    20,972.50x = 31,458.75 × 5,390.13
  4. Step 4: Simplify right side
    20,972.50x = 169,566,752.14
  5. Step 5: Solve for x
    x = 169,566,752.14/20,972.50
  6. Step 6: Final answer
    x = 8,085.20

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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.