Home / 15,388.18-21,228.18-9,720.20

Finding the Fourth Proportional to 15,388.18, 21,228.18 and 9,720.20

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Solution

The fourth proportional to 15,388.18, 21,228.18 and 9,720.20 is: 13,409.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,388.18 : 21,228.18 = 9,720.20 : x
  2. Step 2: Convert to fraction form
    15,388.18/21,228.18 = 9,720.20/x
  3. Step 3: Cross multiply
    15,388.18x = 21,228.18 × 9,720.20
  4. Step 4: Simplify right side
    15,388.18x = 206,342,171.86
  5. Step 5: Solve for x
    x = 206,342,171.86/15,388.18
  6. Step 6: Final answer
    x = 13,409.14

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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.