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Finding the Fourth Proportional to 18,128.79, 27,188.24 and 4,978.04

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Solution

The fourth proportional to 18,128.79, 27,188.24 and 4,978.04 is: 7,465.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,128.79 : 27,188.24 = 4,978.04 : x
  2. Step 2: Convert to fraction form
    18,128.79/27,188.24 = 4,978.04/x
  3. Step 3: Cross multiply
    18,128.79x = 27,188.24 × 4,978.04
  4. Step 4: Simplify right side
    18,128.79x = 135,343,985.42
  5. Step 5: Solve for x
    x = 135,343,985.42/18,128.79
  6. Step 6: Final answer
    x = 7,465.69

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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.