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Finding the Fourth Proportional to 15,876.72, 21,909.15 and 8,802.99

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Solution

The fourth proportional to 15,876.72, 21,909.15 and 8,802.99 is: 12,147.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,876.72 : 21,909.15 = 8,802.99 : x
  2. Step 2: Convert to fraction form
    15,876.72/21,909.15 = 8,802.99/x
  3. Step 3: Cross multiply
    15,876.72x = 21,909.15 × 8,802.99
  4. Step 4: Simplify right side
    15,876.72x = 192,866,028.36
  5. Step 5: Solve for x
    x = 192,866,028.36/15,876.72
  6. Step 6: Final answer
    x = 12,147.72

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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.