Home / 20,280.55-30,402.60-12,881.20

Finding the Fourth Proportional to 20,280.55, 30,402.60 and 12,881.20

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Solution

The fourth proportional to 20,280.55, 30,402.60 and 12,881.20 is: 19,310.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,280.55 : 30,402.60 = 12,881.20 : x
  2. Step 2: Convert to fraction form
    20,280.55/30,402.60 = 12,881.20/x
  3. Step 3: Cross multiply
    20,280.55x = 30,402.60 × 12,881.20
  4. Step 4: Simplify right side
    20,280.55x = 391,621,971.12
  5. Step 5: Solve for x
    x = 391,621,971.12/20,280.55
  6. Step 6: Final answer
    x = 19,310.22

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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.