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Finding the Fourth Proportional to 9,915.71, 13,679.91 and 6,330.80

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Solution

The fourth proportional to 9,915.71, 13,679.91 and 6,330.80 is: 8,734.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,915.71 : 13,679.91 = 6,330.80 : x
  2. Step 2: Convert to fraction form
    9,915.71/13,679.91 = 6,330.80/x
  3. Step 3: Cross multiply
    9,915.71x = 13,679.91 × 6,330.80
  4. Step 4: Simplify right side
    9,915.71x = 86,604,808.43
  5. Step 5: Solve for x
    x = 86,604,808.43/9,915.71
  6. Step 6: Final answer
    x = 8,734.10

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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.