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Finding the Fourth Proportional to 107,405.85, 161,280.90 and 85,402.20

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Solution

The fourth proportional to 107,405.85, 161,280.90 and 85,402.20 is: 128,240.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,405.85 : 161,280.90 = 85,402.20 : x
  2. Step 2: Convert to fraction form
    107,405.85/161,280.90 = 85,402.20/x
  3. Step 3: Cross multiply
    107,405.85x = 161,280.90 × 85,402.20
  4. Step 4: Simplify right side
    107,405.85x = 13,773,743,677.98
  5. Step 5: Solve for x
    x = 13,773,743,677.98/107,405.85
  6. Step 6: Final answer
    x = 128,240.16

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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.