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Finding the Fourth Proportional to 65,720.70, 98,581.05 and 40,788.90

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Solution

The fourth proportional to 65,720.70, 98,581.05 and 40,788.90 is: 61,183.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.70 : 98,581.05 = 40,788.90 : x
  2. Step 2: Convert to fraction form
    65,720.70/98,581.05 = 40,788.90/x
  3. Step 3: Cross multiply
    65,720.70x = 98,581.05 × 40,788.90
  4. Step 4: Simplify right side
    65,720.70x = 4,021,012,590.35
  5. Step 5: Solve for x
    x = 4,021,012,590.35/65,720.70
  6. Step 6: Final answer
    x = 61,183.35

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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.