Home / 21,288.82-29,378.28-11,857.45

Finding the Fourth Proportional to 21,288.82, 29,378.28 and 11,857.45

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Solution

The fourth proportional to 21,288.82, 29,378.28 and 11,857.45 is: 16,363.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,288.82 : 29,378.28 = 11,857.45 : x
  2. Step 2: Convert to fraction form
    21,288.82/29,378.28 = 11,857.45/x
  3. Step 3: Cross multiply
    21,288.82x = 29,378.28 × 11,857.45
  4. Step 4: Simplify right side
    21,288.82x = 348,351,486.19
  5. Step 5: Solve for x
    x = 348,351,486.19/21,288.82
  6. Step 6: Final answer
    x = 16,363.12

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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.