Home / 21,389.39-29,512.62-13,428.71

Finding the Fourth Proportional to 21,389.39, 29,512.62 and 13,428.71

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Solution

The fourth proportional to 21,389.39, 29,512.62 and 13,428.71 is: 18,528.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,389.39 : 29,512.62 = 13,428.71 : x
  2. Step 2: Convert to fraction form
    21,389.39/29,512.62 = 13,428.71/x
  3. Step 3: Cross multiply
    21,389.39x = 29,512.62 × 13,428.71
  4. Step 4: Simplify right side
    21,389.39x = 396,316,415.32
  5. Step 5: Solve for x
    x = 396,316,415.32/21,389.39
  6. Step 6: Final answer
    x = 18,528.65

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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.