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Finding the Fourth Proportional to 66,165.99, 91,315.72 and 39,314.49

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Solution

The fourth proportional to 66,165.99, 91,315.72 and 39,314.49 is: 54,257.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,165.99 : 91,315.72 = 39,314.49 : x
  2. Step 2: Convert to fraction form
    66,165.99/91,315.72 = 39,314.49/x
  3. Step 3: Cross multiply
    66,165.99x = 91,315.72 × 39,314.49
  4. Step 4: Simplify right side
    66,165.99x = 3,590,030,960.78
  5. Step 5: Solve for x
    x = 3,590,030,960.78/66,165.99
  6. Step 6: Final answer
    x = 54,257.95

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1.5x scale

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.