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Finding the Fourth Proportional to 18,312.81, 27,420 and 15,065.11

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Solution

The fourth proportional to 18,312.81, 27,420 and 15,065.11 is: 22,557.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,312.81 : 27,420 = 15,065.11 : x
  2. Step 2: Convert to fraction form
    18,312.81/27,420 = 15,065.11/x
  3. Step 3: Cross multiply
    18,312.81x = 27,420 × 15,065.11
  4. Step 4: Simplify right side
    18,312.81x = 413,085,316.20
  5. Step 5: Solve for x
    x = 413,085,316.20/18,312.81
  6. Step 6: Final answer
    x = 22,557.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.