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Finding the Fourth Proportional to 66,390.93, 91,621.80 and 36,178.74

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Solution

The fourth proportional to 66,390.93, 91,621.80 and 36,178.74 is: 49,927.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,390.93 : 91,621.80 = 36,178.74 : x
  2. Step 2: Convert to fraction form
    66,390.93/91,621.80 = 36,178.74/x
  3. Step 3: Cross multiply
    66,390.93x = 91,621.80 × 36,178.74
  4. Step 4: Simplify right side
    66,390.93x = 3,314,761,280.53
  5. Step 5: Solve for x
    x = 3,314,761,280.53/66,390.93
  6. Step 6: Final answer
    x = 49,927.92

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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.