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Finding the Fourth Proportional to 65,707.74, 90,729.81 and 62,405.37

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Solution

The fourth proportional to 65,707.74, 90,729.81 and 62,405.37 is: 86,169.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,707.74 : 90,729.81 = 62,405.37 : x
  2. Step 2: Convert to fraction form
    65,707.74/90,729.81 = 62,405.37/x
  3. Step 3: Cross multiply
    65,707.74x = 90,729.81 × 62,405.37
  4. Step 4: Simplify right side
    65,707.74x = 5,662,027,363.08
  5. Step 5: Solve for x
    x = 5,662,027,363.08/65,707.74
  6. Step 6: Final answer
    x = 86,169.87

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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.