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Finding the Fourth Proportional to 66,620.70, 91,937.70 and 39,758.00

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Solution

The fourth proportional to 66,620.70, 91,937.70 and 39,758.00 is: 54,866.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,620.70 : 91,937.70 = 39,758.00 : x
  2. Step 2: Convert to fraction form
    66,620.70/91,937.70 = 39,758.00/x
  3. Step 3: Cross multiply
    66,620.70x = 91,937.70 × 39,758.00
  4. Step 4: Simplify right side
    66,620.70x = 3,655,258,616.91
  5. Step 5: Solve for x
    x = 3,655,258,616.91/66,620.70
  6. Step 6: Final answer
    x = 54,866.71

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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.