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Finding the Fourth Proportional to 19,877.78, 29,776.86 and 11,975.90

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Solution

The fourth proportional to 19,877.78, 29,776.86 and 11,975.90 is: 17,939.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,877.78 : 29,776.86 = 11,975.90 : x
  2. Step 2: Convert to fraction form
    19,877.78/29,776.86 = 11,975.90/x
  3. Step 3: Cross multiply
    19,877.78x = 29,776.86 × 11,975.90
  4. Step 4: Simplify right side
    19,877.78x = 356,604,697.67
  5. Step 5: Solve for x
    x = 356,604,697.67/19,877.78
  6. Step 6: Final answer
    x = 17,939.87

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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.