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Finding the Fourth Proportional to 19,911.84, 27,478.13 and 10,959.15

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Solution

The fourth proportional to 19,911.84, 27,478.13 and 10,959.15 is: 15,123.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,911.84 : 27,478.13 = 10,959.15 : x
  2. Step 2: Convert to fraction form
    19,911.84/27,478.13 = 10,959.15/x
  3. Step 3: Cross multiply
    19,911.84x = 27,478.13 × 10,959.15
  4. Step 4: Simplify right side
    19,911.84x = 301,136,824.90
  5. Step 5: Solve for x
    x = 301,136,824.90/19,911.84
  6. Step 6: Final answer
    x = 15,123.51

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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.