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Finding the Fourth Proportional to 10,620.60, 15,911.70 and 9,391.80

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Solution

The fourth proportional to 10,620.60, 15,911.70 and 9,391.80 is: 14,070.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,620.60 : 15,911.70 = 9,391.80 : x
  2. Step 2: Convert to fraction form
    10,620.60/15,911.70 = 9,391.80/x
  3. Step 3: Cross multiply
    10,620.60x = 15,911.70 × 9,391.80
  4. Step 4: Simplify right side
    10,620.60x = 149,439,504.06
  5. Step 5: Solve for x
    x = 149,439,504.06/10,620.60
  6. Step 6: Final answer
    x = 14,070.72

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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.