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Finding the Fourth Proportional to 28,320.80, 39,071.80 and 18,248.44

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Solution

The fourth proportional to 28,320.80, 39,071.80 and 18,248.44 is: 25,175.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,320.80 : 39,071.80 = 18,248.44 : x
  2. Step 2: Convert to fraction form
    28,320.80/39,071.80 = 18,248.44/x
  3. Step 3: Cross multiply
    28,320.80x = 39,071.80 × 18,248.44
  4. Step 4: Simplify right side
    28,320.80x = 712,999,397.99
  5. Step 5: Solve for x
    x = 712,999,397.99/28,320.80
  6. Step 6: Final answer
    x = 25,175.82

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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.