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Finding the Fourth Proportional to 15,190.50, 20,963.70 and 8,904.90

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Solution

The fourth proportional to 15,190.50, 20,963.70 and 8,904.90 is: 12,289.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,190.50 : 20,963.70 = 8,904.90 : x
  2. Step 2: Convert to fraction form
    15,190.50/20,963.70 = 8,904.90/x
  3. Step 3: Cross multiply
    15,190.50x = 20,963.70 × 8,904.90
  4. Step 4: Simplify right side
    15,190.50x = 186,679,652.13
  5. Step 5: Solve for x
    x = 186,679,652.13/15,190.50
  6. Step 6: Final answer
    x = 12,289.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.