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Finding the Fourth Proportional to 12,603.18, 17,381.07 and 7,887.90

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Solution

The fourth proportional to 12,603.18, 17,381.07 and 7,887.90 is: 10,878.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,603.18 : 17,381.07 = 7,887.90 : x
  2. Step 2: Convert to fraction form
    12,603.18/17,381.07 = 7,887.90/x
  3. Step 3: Cross multiply
    12,603.18x = 17,381.07 × 7,887.90
  4. Step 4: Simplify right side
    12,603.18x = 137,100,142.05
  5. Step 5: Solve for x
    x = 137,100,142.05/12,603.18
  6. Step 6: Final answer
    x = 10,878.22

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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.