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Finding the Fourth Proportional to 11,153.01, 15,390.03 and 6,438.81

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Solution

The fourth proportional to 11,153.01, 15,390.03 and 6,438.81 is: 8,884.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,153.01 : 15,390.03 = 6,438.81 : x
  2. Step 2: Convert to fraction form
    11,153.01/15,390.03 = 6,438.81/x
  3. Step 3: Cross multiply
    11,153.01x = 15,390.03 × 6,438.81
  4. Step 4: Simplify right side
    11,153.01x = 99,093,479.06
  5. Step 5: Solve for x
    x = 99,093,479.06/11,153.01
  6. Step 6: Final answer
    x = 8,884.91

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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.