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Finding the Fourth Proportional to 15,879.78, 21,915.63 and 8,807.94

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Solution

The fourth proportional to 15,879.78, 21,915.63 and 8,807.94 is: 12,155.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.78 : 21,915.63 = 8,807.94 : x
  2. Step 2: Convert to fraction form
    15,879.78/21,915.63 = 8,807.94/x
  3. Step 3: Cross multiply
    15,879.78x = 21,915.63 × 8,807.94
  4. Step 4: Simplify right side
    15,879.78x = 193,031,554.10
  5. Step 5: Solve for x
    x = 193,031,554.10/15,879.78
  6. Step 6: Final answer
    x = 12,155.81

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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.