Home / 39,878.20-55,031.16-21,974.86

Finding the Fourth Proportional to 39,878.20, 55,031.16 and 21,974.86

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Solution

The fourth proportional to 39,878.20, 55,031.16 and 21,974.86 is: 30,324.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,878.20 : 55,031.16 = 21,974.86 : x
  2. Step 2: Convert to fraction form
    39,878.20/55,031.16 = 21,974.86/x
  3. Step 3: Cross multiply
    39,878.20x = 55,031.16 × 21,974.86
  4. Step 4: Simplify right side
    39,878.20x = 1,209,302,036.64
  5. Step 5: Solve for x
    x = 1,209,302,036.64/39,878.20
  6. Step 6: Final answer
    x = 30,324.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.