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Finding the Fourth Proportional to 9,990.60, 14,981.54 and 5,309.48

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Solution

The fourth proportional to 9,990.60, 14,981.54 and 5,309.48 is: 7,961.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,990.60 : 14,981.54 = 5,309.48 : x
  2. Step 2: Convert to fraction form
    9,990.60/14,981.54 = 5,309.48/x
  3. Step 3: Cross multiply
    9,990.60x = 14,981.54 × 5,309.48
  4. Step 4: Simplify right side
    9,990.60x = 79,544,187.00
  5. Step 5: Solve for x
    x = 79,544,187.00/9,990.60
  6. Step 6: Final answer
    x = 7,961.90

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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.