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Finding the Fourth Proportional to 28,520.79, 42,780.92 and 7,744.29

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Solution

The fourth proportional to 28,520.79, 42,780.92 and 7,744.29 is: 11,616.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,520.79 : 42,780.92 = 7,744.29 : x
  2. Step 2: Convert to fraction form
    28,520.79/42,780.92 = 7,744.29/x
  3. Step 3: Cross multiply
    28,520.79x = 42,780.92 × 7,744.29
  4. Step 4: Simplify right side
    28,520.79x = 331,307,812.23
  5. Step 5: Solve for x
    x = 331,307,812.23/28,520.79
  6. Step 6: Final answer
    x = 11,616.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.