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Finding the Fourth Proportional to 28,999.50, 40,019.31 and 15,751.50

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Solution

The fourth proportional to 28,999.50, 40,019.31 and 15,751.50 is: 21,737.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,999.50 : 40,019.31 = 15,751.50 : x
  2. Step 2: Convert to fraction form
    28,999.50/40,019.31 = 15,751.50/x
  3. Step 3: Cross multiply
    28,999.50x = 40,019.31 × 15,751.50
  4. Step 4: Simplify right side
    28,999.50x = 630,364,161.47
  5. Step 5: Solve for x
    x = 630,364,161.47/28,999.50
  6. Step 6: Final answer
    x = 21,737.07

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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.