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Finding the Fourth Proportional to 18,398.70, 25,390.22 and 10,015.20

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Solution

The fourth proportional to 18,398.70, 25,390.22 and 10,015.20 is: 13,820.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,398.70 : 25,390.22 = 10,015.20 : x
  2. Step 2: Convert to fraction form
    18,398.70/25,390.22 = 10,015.20/x
  3. Step 3: Cross multiply
    18,398.70x = 25,390.22 × 10,015.20
  4. Step 4: Simplify right side
    18,398.70x = 254,288,131.34
  5. Step 5: Solve for x
    x = 254,288,131.34/18,398.70
  6. Step 6: Final answer
    x = 13,820.98

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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.