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Finding the Fourth Proportional to 28,705.72, 43,061.08 and 7,929.24

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Solution

The fourth proportional to 28,705.72, 43,061.08 and 7,929.24 is: 11,894.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,705.72 : 43,061.08 = 7,929.24 : x
  2. Step 2: Convert to fraction form
    28,705.72/43,061.08 = 7,929.24/x
  3. Step 3: Cross multiply
    28,705.72x = 43,061.08 × 7,929.24
  4. Step 4: Simplify right side
    28,705.72x = 341,441,637.98
  5. Step 5: Solve for x
    x = 341,441,637.98/28,705.72
  6. Step 6: Final answer
    x = 11,894.55

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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.