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Finding the Fourth Proportional to 85,929.29, 128,876.78 and 28,997.63

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Solution

The fourth proportional to 85,929.29, 128,876.78 and 28,997.63 is: 43,490.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,929.29 : 128,876.78 = 28,997.63 : x
  2. Step 2: Convert to fraction form
    85,929.29/128,876.78 = 28,997.63/x
  3. Step 3: Cross multiply
    85,929.29x = 128,876.78 × 28,997.63
  4. Step 4: Simplify right side
    85,929.29x = 3,737,120,392.66
  5. Step 5: Solve for x
    x = 3,737,120,392.66/85,929.29
  6. Step 6: Final answer
    x = 43,490.65

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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.