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Finding the Fourth Proportional to 15,811.40, 23,673.90 and 12,355.40

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Solution

The fourth proportional to 15,811.40, 23,673.90 and 12,355.40 is: 18,499.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,811.40 : 23,673.90 = 12,355.40 : x
  2. Step 2: Convert to fraction form
    15,811.40/23,673.90 = 12,355.40/x
  3. Step 3: Cross multiply
    15,811.40x = 23,673.90 × 12,355.40
  4. Step 4: Simplify right side
    15,811.40x = 292,500,504.06
  5. Step 5: Solve for x
    x = 292,500,504.06/15,811.40
  6. Step 6: Final answer
    x = 18,499.34

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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.