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Finding the Fourth Proportional to 18,371.71, 25,352.94 and 9,988.21

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Solution

The fourth proportional to 18,371.71, 25,352.94 and 9,988.21 is: 13,783.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,371.71 : 25,352.94 = 9,988.21 : x
  2. Step 2: Convert to fraction form
    18,371.71/25,352.94 = 9,988.21/x
  3. Step 3: Cross multiply
    18,371.71x = 25,352.94 × 9,988.21
  4. Step 4: Simplify right side
    18,371.71x = 253,230,488.84
  5. Step 5: Solve for x
    x = 253,230,488.84/18,371.71
  6. Step 6: Final answer
    x = 13,783.72

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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.