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Finding the Fourth Proportional to 8,915.88, 12,290.82 and 6,787.72

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Solution

The fourth proportional to 8,915.88, 12,290.82 and 6,787.72 is: 9,357.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,915.88 : 12,290.82 = 6,787.72 : x
  2. Step 2: Convert to fraction form
    8,915.88/12,290.82 = 6,787.72/x
  3. Step 3: Cross multiply
    8,915.88x = 12,290.82 × 6,787.72
  4. Step 4: Simplify right side
    8,915.88x = 83,426,634.64
  5. Step 5: Solve for x
    x = 83,426,634.64/8,915.88
  6. Step 6: Final answer
    x = 9,357.08

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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.