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Finding the Fourth Proportional to 66,378.53, 91,512.79 and 64,314.65

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Solution

The fourth proportional to 66,378.53, 91,512.79 and 64,314.65 is: 88,667.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,378.53 : 91,512.79 = 64,314.65 : x
  2. Step 2: Convert to fraction form
    66,378.53/91,512.79 = 64,314.65/x
  3. Step 3: Cross multiply
    66,378.53x = 91,512.79 × 64,314.65
  4. Step 4: Simplify right side
    66,378.53x = 5,885,613,127.37
  5. Step 5: Solve for x
    x = 5,885,613,127.37/66,378.53
  6. Step 6: Final answer
    x = 88,667.42

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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.