Home / 20,987.47-28,964.75-15,673.06

Finding the Fourth Proportional to 20,987.47, 28,964.75 and 15,673.06

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Solution

The fourth proportional to 20,987.47, 28,964.75 and 15,673.06 is: 21,630.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.47 : 28,964.75 = 15,673.06 : x
  2. Step 2: Convert to fraction form
    20,987.47/28,964.75 = 15,673.06/x
  3. Step 3: Cross multiply
    20,987.47x = 28,964.75 × 15,673.06
  4. Step 4: Simplify right side
    20,987.47x = 453,966,144.36
  5. Step 5: Solve for x
    x = 453,966,144.36/20,987.47
  6. Step 6: Final answer
    x = 21,630.34

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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.