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Finding the Fourth Proportional to 19,938.80, 29,893.80 and 11,176.40

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Solution

The fourth proportional to 19,938.80, 29,893.80 and 11,176.40 is: 16,756.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,938.80 : 29,893.80 = 11,176.40 : x
  2. Step 2: Convert to fraction form
    19,938.80/29,893.80 = 11,176.40/x
  3. Step 3: Cross multiply
    19,938.80x = 29,893.80 × 11,176.40
  4. Step 4: Simplify right side
    19,938.80x = 334,105,066.32
  5. Step 5: Solve for x
    x = 334,105,066.32/19,938.80
  6. Step 6: Final answer
    x = 16,756.53

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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.