Home / 15,858.10-21,839.79-15,513.72

Finding the Fourth Proportional to 15,858.10, 21,839.79 and 15,513.72

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Solution

The fourth proportional to 15,858.10, 21,839.79 and 15,513.72 is: 21,365.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,858.10 : 21,839.79 = 15,513.72 : x
  2. Step 2: Convert to fraction form
    15,858.10/21,839.79 = 15,513.72/x
  3. Step 3: Cross multiply
    15,858.10x = 21,839.79 × 15,513.72
  4. Step 4: Simplify right side
    15,858.10x = 338,816,386.92
  5. Step 5: Solve for x
    x = 338,816,386.92/15,858.10
  6. Step 6: Final answer
    x = 21,365.51

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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.