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Finding the Fourth Proportional to 28,705.61, 43,060.89 and 7,929.11

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Solution

The fourth proportional to 28,705.61, 43,060.89 and 7,929.11 is: 11,894.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,705.61 : 43,060.89 = 7,929.11 : x
  2. Step 2: Convert to fraction form
    28,705.61/43,060.89 = 7,929.11/x
  3. Step 3: Cross multiply
    28,705.61x = 43,060.89 × 7,929.11
  4. Step 4: Simplify right side
    28,705.61x = 341,434,318.20
  5. Step 5: Solve for x
    x = 341,434,318.20/28,705.61
  6. Step 6: Final answer
    x = 11,894.34

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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.