Home / 21,351.78-29,465.37-12,399.66

Finding the Fourth Proportional to 21,351.78, 29,465.37 and 12,399.66

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Solution

The fourth proportional to 21,351.78, 29,465.37 and 12,399.66 is: 17,111.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,351.78 : 29,465.37 = 12,399.66 : x
  2. Step 2: Convert to fraction form
    21,351.78/29,465.37 = 12,399.66/x
  3. Step 3: Cross multiply
    21,351.78x = 29,465.37 × 12,399.66
  4. Step 4: Simplify right side
    21,351.78x = 365,360,569.77
  5. Step 5: Solve for x
    x = 365,360,569.77/21,351.78
  6. Step 6: Final answer
    x = 17,111.48

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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.