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Finding the Fourth Proportional to 65,790.12, 90,790.90 and 36,322.80

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Solution

The fourth proportional to 65,790.12, 90,790.90 and 36,322.80 is: 50,125.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,790.12 : 90,790.90 = 36,322.80 : x
  2. Step 2: Convert to fraction form
    65,790.12/90,790.90 = 36,322.80/x
  3. Step 3: Cross multiply
    65,790.12x = 90,790.90 × 36,322.80
  4. Step 4: Simplify right side
    65,790.12x = 3,297,779,501.08
  5. Step 5: Solve for x
    x = 3,297,779,501.08/65,790.12
  6. Step 6: Final answer
    x = 50,125.76

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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.