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Finding the Fourth Proportional to 65,720.80, 90,704.10 and 37,429.12

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Solution

The fourth proportional to 65,720.80, 90,704.10 and 37,429.12 is: 51,657.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.80 : 90,704.10 = 37,429.12 : x
  2. Step 2: Convert to fraction form
    65,720.80/90,704.10 = 37,429.12/x
  3. Step 3: Cross multiply
    65,720.80x = 90,704.10 × 37,429.12
  4. Step 4: Simplify right side
    65,720.80x = 3,394,974,643.39
  5. Step 5: Solve for x
    x = 3,394,974,643.39/65,720.80
  6. Step 6: Final answer
    x = 51,657.54

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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.