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Finding the Fourth Proportional to 15,953.60, 21,993.15 and 11,223.20

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Solution

The fourth proportional to 15,953.60, 21,993.15 and 11,223.20 is: 15,471.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,953.60 : 21,993.15 = 11,223.20 : x
  2. Step 2: Convert to fraction form
    15,953.60/21,993.15 = 11,223.20/x
  3. Step 3: Cross multiply
    15,953.60x = 21,993.15 × 11,223.20
  4. Step 4: Simplify right side
    15,953.60x = 246,833,521.08
  5. Step 5: Solve for x
    x = 246,833,521.08/15,953.60
  6. Step 6: Final answer
    x = 15,471.96

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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.