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Finding the Fourth Proportional to 18,678.78, 28,018.13 and 8,678.06

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Solution

The fourth proportional to 18,678.78, 28,018.13 and 8,678.06 is: 13,017.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,678.78 : 28,018.13 = 8,678.06 : x
  2. Step 2: Convert to fraction form
    18,678.78/28,018.13 = 8,678.06/x
  3. Step 3: Cross multiply
    18,678.78x = 28,018.13 × 8,678.06
  4. Step 4: Simplify right side
    18,678.78x = 243,142,829.75
  5. Step 5: Solve for x
    x = 243,142,829.75/18,678.78
  6. Step 6: Final answer
    x = 13,017.06

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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.