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Finding the Fourth Proportional to 18,878.68, 28,317.99 and 8,478.28

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Solution

The fourth proportional to 18,878.68, 28,317.99 and 8,478.28 is: 12,717.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.68 : 28,317.99 = 8,478.28 : x
  2. Step 2: Convert to fraction form
    18,878.68/28,317.99 = 8,478.28/x
  3. Step 3: Cross multiply
    18,878.68x = 28,317.99 × 8,478.28
  4. Step 4: Simplify right side
    18,878.68x = 240,087,848.26
  5. Step 5: Solve for x
    x = 240,087,848.26/18,878.68
  6. Step 6: Final answer
    x = 12,717.41

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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.