Home / 28,315.80-42,638.30-20,972.28

Finding the Fourth Proportional to 28,315.80, 42,638.30 and 20,972.28

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Solution

The fourth proportional to 28,315.80, 42,638.30 and 20,972.28 is: 31,580.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,315.80 : 42,638.30 = 20,972.28 : x
  2. Step 2: Convert to fraction form
    28,315.80/42,638.30 = 20,972.28/x
  3. Step 3: Cross multiply
    28,315.80x = 42,638.30 × 20,972.28
  4. Step 4: Simplify right side
    28,315.80x = 894,222,366.32
  5. Step 5: Solve for x
    x = 894,222,366.32/28,315.80
  6. Step 6: Final answer
    x = 31,580.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.