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Finding the Fourth Proportional to 78,745.72, 118,119.04 and 19,581.40

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Solution

The fourth proportional to 78,745.72, 118,119.04 and 19,581.40 is: 29,372.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,745.72 : 118,119.04 = 19,581.40 : x
  2. Step 2: Convert to fraction form
    78,745.72/118,119.04 = 19,581.40/x
  3. Step 3: Cross multiply
    78,745.72x = 118,119.04 × 19,581.40
  4. Step 4: Simplify right side
    78,745.72x = 2,312,936,169.86
  5. Step 5: Solve for x
    x = 2,312,936,169.86/78,745.72
  6. Step 6: Final answer
    x = 29,372.21

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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.