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Finding the Fourth Proportional to 19,915.01, 29,854.05 and 8,815.78

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Solution

The fourth proportional to 19,915.01, 29,854.05 and 8,815.78 is: 13,215.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,915.01 : 29,854.05 = 8,815.78 : x
  2. Step 2: Convert to fraction form
    19,915.01/29,854.05 = 8,815.78/x
  3. Step 3: Cross multiply
    19,915.01x = 29,854.05 × 8,815.78
  4. Step 4: Simplify right side
    19,915.01x = 263,186,736.91
  5. Step 5: Solve for x
    x = 263,186,736.91/19,915.01
  6. Step 6: Final answer
    x = 13,215.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.