Home / 28,910.16-39,878.28-21,348.72

Finding the Fourth Proportional to 28,910.16, 39,878.28 and 21,348.72

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Solution

The fourth proportional to 28,910.16, 39,878.28 and 21,348.72 is: 29,448.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,910.16 : 39,878.28 = 21,348.72 : x
  2. Step 2: Convert to fraction form
    28,910.16/39,878.28 = 21,348.72/x
  3. Step 3: Cross multiply
    28,910.16x = 39,878.28 × 21,348.72
  4. Step 4: Simplify right side
    28,910.16x = 851,350,233.80
  5. Step 5: Solve for x
    x = 851,350,233.80/28,910.16
  6. Step 6: Final answer
    x = 29,448.13

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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.