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Finding the Fourth Proportional to 8,636.80, 11,915.76 and 5,654.40

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Solution

The fourth proportional to 8,636.80, 11,915.76 and 5,654.40 is: 7,801.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,636.80 : 11,915.76 = 5,654.40 : x
  2. Step 2: Convert to fraction form
    8,636.80/11,915.76 = 5,654.40/x
  3. Step 3: Cross multiply
    8,636.80x = 11,915.76 × 5,654.40
  4. Step 4: Simplify right side
    8,636.80x = 67,376,473.34
  5. Step 5: Solve for x
    x = 67,376,473.34/8,636.80
  6. Step 6: Final answer
    x = 7,801.09

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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.