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Finding the Fourth Proportional to 18,878.91, 28,316.54 and 5,731.40

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Solution

The fourth proportional to 18,878.91, 28,316.54 and 5,731.40 is: 8,596.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.91 : 28,316.54 = 5,731.40 : x
  2. Step 2: Convert to fraction form
    18,878.91/28,316.54 = 5,731.40/x
  3. Step 3: Cross multiply
    18,878.91x = 28,316.54 × 5,731.40
  4. Step 4: Simplify right side
    18,878.91x = 162,293,417.36
  5. Step 5: Solve for x
    x = 162,293,417.36/18,878.91
  6. Step 6: Final answer
    x = 8,596.55

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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.