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Finding the Fourth Proportional to 15,879.84, 21,921.21 and 11,118.50

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Solution

The fourth proportional to 15,879.84, 21,921.21 and 11,118.50 is: 15,348.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,879.84 : 21,921.21 = 11,118.50 : x
  2. Step 2: Convert to fraction form
    15,879.84/21,921.21 = 11,118.50/x
  3. Step 3: Cross multiply
    15,879.84x = 21,921.21 × 11,118.50
  4. Step 4: Simplify right side
    15,879.84x = 243,730,973.39
  5. Step 5: Solve for x
    x = 243,730,973.39/15,879.84
  6. Step 6: Final answer
    x = 15,348.45

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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.