Home / 39,891.78-55,051.02-21,987.45

Finding the Fourth Proportional to 39,891.78, 55,051.02 and 21,987.45

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Solution

The fourth proportional to 39,891.78, 55,051.02 and 21,987.45 is: 30,342.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,891.78 : 55,051.02 = 21,987.45 : x
  2. Step 2: Convert to fraction form
    39,891.78/55,051.02 = 21,987.45/x
  3. Step 3: Cross multiply
    39,891.78x = 55,051.02 × 21,987.45
  4. Step 4: Simplify right side
    39,891.78x = 1,210,431,549.70
  5. Step 5: Solve for x
    x = 1,210,431,549.70/39,891.78
  6. Step 6: Final answer
    x = 30,342.88

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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.