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Finding the Fourth Proportional to 66,143.64, 91,292.66 and 40,671.92

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Solution

The fourth proportional to 66,143.64, 91,292.66 and 40,671.92 is: 56,136.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,143.64 : 91,292.66 = 40,671.92 : x
  2. Step 2: Convert to fraction form
    66,143.64/91,292.66 = 40,671.92/x
  3. Step 3: Cross multiply
    66,143.64x = 91,292.66 × 40,671.92
  4. Step 4: Simplify right side
    66,143.64x = 3,713,047,764.11
  5. Step 5: Solve for x
    x = 3,713,047,764.11/66,143.64
  6. Step 6: Final answer
    x = 56,136.13

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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.