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Finding the Fourth Proportional to 9,117.80, 13,669.40 and 8,388.80

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Solution

The fourth proportional to 9,117.80, 13,669.40 and 8,388.80 is: 12,576.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,117.80 : 13,669.40 = 8,388.80 : x
  2. Step 2: Convert to fraction form
    9,117.80/13,669.40 = 8,388.80/x
  3. Step 3: Cross multiply
    9,117.80x = 13,669.40 × 8,388.80
  4. Step 4: Simplify right side
    9,117.80x = 114,669,862.72
  5. Step 5: Solve for x
    x = 114,669,862.72/9,117.80
  6. Step 6: Final answer
    x = 12,576.48

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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.