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Finding the Fourth Proportional to 28,976, 39,988.88 and 16,400.80

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Solution

The fourth proportional to 28,976, 39,988.88 and 16,400.80 is: 22,634.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,976 : 39,988.88 = 16,400.80 : x
  2. Step 2: Convert to fraction form
    28,976/39,988.88 = 16,400.80/x
  3. Step 3: Cross multiply
    28,976x = 39,988.88 × 16,400.80
  4. Step 4: Simplify right side
    28,976x = 655,849,623.10
  5. Step 5: Solve for x
    x = 655,849,623.10/28,976
  6. Step 6: Final answer
    x = 22,634.24

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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.