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Finding the Fourth Proportional to 65,505.78, 90,401.67 and 49,562.55

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Solution

The fourth proportional to 65,505.78, 90,401.67 and 49,562.55 is: 68,399.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,505.78 : 90,401.67 = 49,562.55 : x
  2. Step 2: Convert to fraction form
    65,505.78/90,401.67 = 49,562.55/x
  3. Step 3: Cross multiply
    65,505.78x = 90,401.67 × 49,562.55
  4. Step 4: Simplify right side
    65,505.78x = 4,480,537,289.46
  5. Step 5: Solve for x
    x = 4,480,537,289.46/65,505.78
  6. Step 6: Final answer
    x = 68,399.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.