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Finding the Fourth Proportional to 9,885.80, 13,657.22 and 6,490.87

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Solution

The fourth proportional to 9,885.80, 13,657.22 and 6,490.87 is: 8,967.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,885.80 : 13,657.22 = 6,490.87 : x
  2. Step 2: Convert to fraction form
    9,885.80/13,657.22 = 6,490.87/x
  3. Step 3: Cross multiply
    9,885.80x = 13,657.22 × 6,490.87
  4. Step 4: Simplify right side
    9,885.80x = 88,647,233.84
  5. Step 5: Solve for x
    x = 88,647,233.84/9,885.80
  6. Step 6: Final answer
    x = 8,967.13

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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.