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Finding the Fourth Proportional to 109,040.80, 163,561.20 and 85,421.20

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Solution

The fourth proportional to 109,040.80, 163,561.20 and 85,421.20 is: 128,131.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,040.80 : 163,561.20 = 85,421.20 : x
  2. Step 2: Convert to fraction form
    109,040.80/163,561.20 = 85,421.20/x
  3. Step 3: Cross multiply
    109,040.80x = 163,561.20 × 85,421.20
  4. Step 4: Simplify right side
    109,040.80x = 13,971,593,977.44
  5. Step 5: Solve for x
    x = 13,971,593,977.44/109,040.80
  6. Step 6: Final answer
    x = 128,131.80

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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.