Home / 15,317.87-21,138.11-9,359.51

Finding the Fourth Proportional to 15,317.87, 21,138.11 and 9,359.51

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Solution

The fourth proportional to 15,317.87, 21,138.11 and 9,359.51 is: 12,915.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,317.87 : 21,138.11 = 9,359.51 : x
  2. Step 2: Convert to fraction form
    15,317.87/21,138.11 = 9,359.51/x
  3. Step 3: Cross multiply
    15,317.87x = 21,138.11 × 9,359.51
  4. Step 4: Simplify right side
    15,317.87x = 197,842,199.44
  5. Step 5: Solve for x
    x = 197,842,199.44/15,317.87
  6. Step 6: Final answer
    x = 12,915.78

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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.