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Finding the Fourth Proportional to 18,678.38, 27,986.42 and 15,356.87

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Solution

The fourth proportional to 18,678.38, 27,986.42 and 15,356.87 is: 23,009.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,678.38 : 27,986.42 = 15,356.87 : x
  2. Step 2: Convert to fraction form
    18,678.38/27,986.42 = 15,356.87/x
  3. Step 3: Cross multiply
    18,678.38x = 27,986.42 × 15,356.87
  4. Step 4: Simplify right side
    18,678.38x = 429,783,848.55
  5. Step 5: Solve for x
    x = 429,783,848.55/18,678.38
  6. Step 6: Final answer
    x = 23,009.70

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1.5x scale

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.