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Finding the Fourth Proportional to 66,378.61, 91,602.10 and 36,163.87

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Solution

The fourth proportional to 66,378.61, 91,602.10 and 36,163.87 is: 49,905.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,378.61 : 91,602.10 = 36,163.87 : x
  2. Step 2: Convert to fraction form
    66,378.61/91,602.10 = 36,163.87/x
  3. Step 3: Cross multiply
    66,378.61x = 91,602.10 × 36,163.87
  4. Step 4: Simplify right side
    66,378.61x = 3,312,686,436.13
  5. Step 5: Solve for x
    x = 3,312,686,436.13/66,378.61
  6. Step 6: Final answer
    x = 49,905.93

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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.