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Finding the Fourth Proportional to 9,871.15, 13,622.19 and 5,679.40

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Solution

The fourth proportional to 9,871.15, 13,622.19 and 5,679.40 is: 7,837.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,871.15 : 13,622.19 = 5,679.40 : x
  2. Step 2: Convert to fraction form
    9,871.15/13,622.19 = 5,679.40/x
  3. Step 3: Cross multiply
    9,871.15x = 13,622.19 × 5,679.40
  4. Step 4: Simplify right side
    9,871.15x = 77,365,865.89
  5. Step 5: Solve for x
    x = 77,365,865.89/9,871.15
  6. Step 6: Final answer
    x = 7,837.57

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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.