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Finding the Fourth Proportional to 10,890.16, 16,332.22 and 2,990.78

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Solution

The fourth proportional to 10,890.16, 16,332.22 and 2,990.78 is: 4,485.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,890.16 : 16,332.22 = 2,990.78 : x
  2. Step 2: Convert to fraction form
    10,890.16/16,332.22 = 2,990.78/x
  3. Step 3: Cross multiply
    10,890.16x = 16,332.22 × 2,990.78
  4. Step 4: Simplify right side
    10,890.16x = 48,846,076.93
  5. Step 5: Solve for x
    x = 48,846,076.93/10,890.16
  6. Step 6: Final answer
    x = 4,485.34

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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.