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Finding the Fourth Proportional to 11,390.88, 15,718.88 and 6,354.80

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Solution

The fourth proportional to 11,390.88, 15,718.88 and 6,354.80 is: 8,769.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,390.88 : 15,718.88 = 6,354.80 : x
  2. Step 2: Convert to fraction form
    11,390.88/15,718.88 = 6,354.80/x
  3. Step 3: Cross multiply
    11,390.88x = 15,718.88 × 6,354.80
  4. Step 4: Simplify right side
    11,390.88x = 99,890,338.62
  5. Step 5: Solve for x
    x = 99,890,338.62/11,390.88
  6. Step 6: Final answer
    x = 8,769.33

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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.