Home / 28,438.80-39,261.56-19,723.20

Finding the Fourth Proportional to 28,438.80, 39,261.56 and 19,723.20

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Solution

The fourth proportional to 28,438.80, 39,261.56 and 19,723.20 is: 27,229.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,438.80 : 39,261.56 = 19,723.20 : x
  2. Step 2: Convert to fraction form
    28,438.80/39,261.56 = 19,723.20/x
  3. Step 3: Cross multiply
    28,438.80x = 39,261.56 × 19,723.20
  4. Step 4: Simplify right side
    28,438.80x = 774,363,600.19
  5. Step 5: Solve for x
    x = 774,363,600.19/28,438.80
  6. Step 6: Final answer
    x = 27,229.12

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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.