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Finding the Fourth Proportional to 28,980.34, 39,990.84 and 16,231.34

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Solution

The fourth proportional to 28,980.34, 39,990.84 and 16,231.34 is: 22,398.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,980.34 : 39,990.84 = 16,231.34 : x
  2. Step 2: Convert to fraction form
    28,980.34/39,990.84 = 16,231.34/x
  3. Step 3: Cross multiply
    28,980.34x = 39,990.84 × 16,231.34
  4. Step 4: Simplify right side
    28,980.34x = 649,104,920.93
  5. Step 5: Solve for x
    x = 649,104,920.93/28,980.34
  6. Step 6: Final answer
    x = 22,398.11

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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.