Home / 39,878.11-55,031.14-21,729.05

Finding the Fourth Proportional to 39,878.11, 55,031.14 and 21,729.05

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Solution

The fourth proportional to 39,878.11, 55,031.14 and 21,729.05 is: 29,985.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,878.11 : 55,031.14 = 21,729.05 : x
  2. Step 2: Convert to fraction form
    39,878.11/55,031.14 = 21,729.05/x
  3. Step 3: Cross multiply
    39,878.11x = 55,031.14 × 21,729.05
  4. Step 4: Simplify right side
    39,878.11x = 1,195,774,273.07
  5. Step 5: Solve for x
    x = 1,195,774,273.07/39,878.11
  6. Step 6: Final answer
    x = 29,985.73

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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.