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Finding the Fourth Proportional to 20,808.60, 31,148.10 and 20,160.60

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Solution

The fourth proportional to 20,808.60, 31,148.10 and 20,160.60 is: 30,178.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.60 : 31,148.10 = 20,160.60 : x
  2. Step 2: Convert to fraction form
    20,808.60/31,148.10 = 20,160.60/x
  3. Step 3: Cross multiply
    20,808.60x = 31,148.10 × 20,160.60
  4. Step 4: Simplify right side
    20,808.60x = 627,964,384.86
  5. Step 5: Solve for x
    x = 627,964,384.86/20,808.60
  6. Step 6: Final answer
    x = 30,178.12

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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.