Home / 20,974.77-31,430.45-12,645.47

Finding the Fourth Proportional to 20,974.77, 31,430.45 and 12,645.47

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Solution

The fourth proportional to 20,974.77, 31,430.45 and 12,645.47 is: 18,949.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,974.77 : 31,430.45 = 12,645.47 : x
  2. Step 2: Convert to fraction form
    20,974.77/31,430.45 = 12,645.47/x
  3. Step 3: Cross multiply
    20,974.77x = 31,430.45 × 12,645.47
  4. Step 4: Simplify right side
    20,974.77x = 397,452,592.18
  5. Step 5: Solve for x
    x = 397,452,592.18/20,974.77
  6. Step 6: Final answer
    x = 18,949.08

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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.