Home / 39,884.13-55,038.12-21,978.75

Finding the Fourth Proportional to 39,884.13, 55,038.12 and 21,978.75

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Solution

The fourth proportional to 39,884.13, 55,038.12 and 21,978.75 is: 30,329.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,884.13 : 55,038.12 = 21,978.75 : x
  2. Step 2: Convert to fraction form
    39,884.13/55,038.12 = 21,978.75/x
  3. Step 3: Cross multiply
    39,884.13x = 55,038.12 × 21,978.75
  4. Step 4: Simplify right side
    39,884.13x = 1,209,669,079.95
  5. Step 5: Solve for x
    x = 1,209,669,079.95/39,884.13
  6. Step 6: Final answer
    x = 30,329.58

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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.