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Finding the Fourth Proportional to 66,443.80, 99,665.70 and 53,321.80

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Solution

The fourth proportional to 66,443.80, 99,665.70 and 53,321.80 is: 79,982.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,443.80 : 99,665.70 = 53,321.80 : x
  2. Step 2: Convert to fraction form
    66,443.80/99,665.70 = 53,321.80/x
  3. Step 3: Cross multiply
    66,443.80x = 99,665.70 × 53,321.80
  4. Step 4: Simplify right side
    66,443.80x = 5,314,354,522.26
  5. Step 5: Solve for x
    x = 5,314,354,522.26/66,443.80
  6. Step 6: Final answer
    x = 79,982.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.