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Finding the Fourth Proportional to 66,065.50, 91,170.39 and 39,569.50

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Solution

The fourth proportional to 66,065.50, 91,170.39 and 39,569.50 is: 54,605.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,065.50 : 91,170.39 = 39,569.50 : x
  2. Step 2: Convert to fraction form
    66,065.50/91,170.39 = 39,569.50/x
  3. Step 3: Cross multiply
    66,065.50x = 91,170.39 × 39,569.50
  4. Step 4: Simplify right side
    66,065.50x = 3,607,566,747.11
  5. Step 5: Solve for x
    x = 3,607,566,747.11/66,065.50
  6. Step 6: Final answer
    x = 54,605.91

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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.