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Finding the Fourth Proportional to 20,693.40, 31,040.10 and 8,216.40

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Solution

The fourth proportional to 20,693.40, 31,040.10 and 8,216.40 is: 12,324.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,693.40 : 31,040.10 = 8,216.40 : x
  2. Step 2: Convert to fraction form
    20,693.40/31,040.10 = 8,216.40/x
  3. Step 3: Cross multiply
    20,693.40x = 31,040.10 × 8,216.40
  4. Step 4: Simplify right side
    20,693.40x = 255,037,877.64
  5. Step 5: Solve for x
    x = 255,037,877.64/20,693.40
  6. Step 6: Final answer
    x = 12,324.60

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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.