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Finding the Fourth Proportional to 40,478.72, 60,720.96 and 12,776

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Solution

The fourth proportional to 40,478.72, 60,720.96 and 12,776 is: 19,164.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,478.72 : 60,720.96 = 12,776 : x
  2. Step 2: Convert to fraction form
    40,478.72/60,720.96 = 12,776/x
  3. Step 3: Cross multiply
    40,478.72x = 60,720.96 × 12,776
  4. Step 4: Simplify right side
    40,478.72x = 775,770,984.96
  5. Step 5: Solve for x
    x = 775,770,984.96/40,478.72
  6. Step 6: Final answer
    x = 19,164.91

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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.