Home / 28,018.40-38,665.20-15,443.12

Finding the Fourth Proportional to 28,018.40, 38,665.20 and 15,443.12

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Solution

The fourth proportional to 28,018.40, 38,665.20 and 15,443.12 is: 21,311.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,018.40 : 38,665.20 = 15,443.12 : x
  2. Step 2: Convert to fraction form
    28,018.40/38,665.20 = 15,443.12/x
  3. Step 3: Cross multiply
    28,018.40x = 38,665.20 × 15,443.12
  4. Step 4: Simplify right side
    28,018.40x = 597,111,323.42
  5. Step 5: Solve for x
    x = 597,111,323.42/28,018.40
  6. Step 6: Final answer
    x = 21,311.40

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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.