Home / 15,711.12-21,656.16-11,921.94

Finding the Fourth Proportional to 15,711.12, 21,656.16 and 11,921.94

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Solution

The fourth proportional to 15,711.12, 21,656.16 and 11,921.94 is: 16,433.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,711.12 : 21,656.16 = 11,921.94 : x
  2. Step 2: Convert to fraction form
    15,711.12/21,656.16 = 11,921.94/x
  3. Step 3: Cross multiply
    15,711.12x = 21,656.16 × 11,921.94
  4. Step 4: Simplify right side
    15,711.12x = 258,183,440.15
  5. Step 5: Solve for x
    x = 258,183,440.15/15,711.12
  6. Step 6: Final answer
    x = 16,433.17

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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.