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Finding the Fourth Proportional to 66,389.94, 91,572.57 and 39,511.71

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Solution

The fourth proportional to 66,389.94, 91,572.57 and 39,511.71 is: 54,499.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,389.94 : 91,572.57 = 39,511.71 : x
  2. Step 2: Convert to fraction form
    66,389.94/91,572.57 = 39,511.71/x
  3. Step 3: Cross multiply
    66,389.94x = 91,572.57 × 39,511.71
  4. Step 4: Simplify right side
    66,389.94x = 3,618,188,829.79
  5. Step 5: Solve for x
    x = 3,618,188,829.79/66,389.94
  6. Step 6: Final answer
    x = 54,499.05

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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.