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Finding the Fourth Proportional to 18,712.49, 25,798.42 and 15,513.71

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Solution

The fourth proportional to 18,712.49, 25,798.42 and 15,513.71 is: 21,388.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.49 : 25,798.42 = 15,513.71 : x
  2. Step 2: Convert to fraction form
    18,712.49/25,798.42 = 15,513.71/x
  3. Step 3: Cross multiply
    18,712.49x = 25,798.42 × 15,513.71
  4. Step 4: Simplify right side
    18,712.49x = 400,229,206.34
  5. Step 5: Solve for x
    x = 400,229,206.34/18,712.49
  6. Step 6: Final answer
    x = 21,388.35

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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.