Home / 20,995.47-28,975.80-15,681.06

Finding the Fourth Proportional to 20,995.47, 28,975.80 and 15,681.06

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Solution

The fourth proportional to 20,995.47, 28,975.80 and 15,681.06 is: 21,641.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995.47 : 28,975.80 = 15,681.06 : x
  2. Step 2: Convert to fraction form
    20,995.47/28,975.80 = 15,681.06/x
  3. Step 3: Cross multiply
    20,995.47x = 28,975.80 × 15,681.06
  4. Step 4: Simplify right side
    20,995.47x = 454,371,179.94
  5. Step 5: Solve for x
    x = 454,371,179.94/20,995.47
  6. Step 6: Final answer
    x = 21,641.39

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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.