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Finding the Fourth Proportional to 11,154, 15,391.44 and 6,439.80

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Solution

The fourth proportional to 11,154, 15,391.44 and 6,439.80 is: 8,886.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,154 : 15,391.44 = 6,439.80 : x
  2. Step 2: Convert to fraction form
    11,154/15,391.44 = 6,439.80/x
  3. Step 3: Cross multiply
    11,154x = 15,391.44 × 6,439.80
  4. Step 4: Simplify right side
    11,154x = 99,117,795.31
  5. Step 5: Solve for x
    x = 99,117,795.31/11,154
  6. Step 6: Final answer
    x = 8,886.30

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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.