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Finding the Fourth Proportional to 40,407.91, 60,611.86 and 12,705.91

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Solution

The fourth proportional to 40,407.91, 60,611.86 and 12,705.91 is: 19,058.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,407.91 : 60,611.86 = 12,705.91 : x
  2. Step 2: Convert to fraction form
    40,407.91/60,611.86 = 12,705.91/x
  3. Step 3: Cross multiply
    40,407.91x = 60,611.86 × 12,705.91
  4. Step 4: Simplify right side
    40,407.91x = 770,128,838.09
  5. Step 5: Solve for x
    x = 770,128,838.09/40,407.91
  6. Step 6: Final answer
    x = 19,058.86

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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.