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Finding the Fourth Proportional to 66,571.55, 91,868.52 and 39,715.19

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Solution

The fourth proportional to 66,571.55, 91,868.52 and 39,715.19 is: 54,806.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,571.55 : 91,868.52 = 39,715.19 : x
  2. Step 2: Convert to fraction form
    66,571.55/91,868.52 = 39,715.19/x
  3. Step 3: Cross multiply
    66,571.55x = 91,868.52 × 39,715.19
  4. Step 4: Simplify right side
    66,571.55x = 3,648,575,726.82
  5. Step 5: Solve for x
    x = 3,648,575,726.82/66,571.55
  6. Step 6: Final answer
    x = 54,806.83

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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.