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Finding the Fourth Proportional to 18,866.86, 28,298.65 and 6,386.61

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Solution

The fourth proportional to 18,866.86, 28,298.65 and 6,386.61 is: 9,579.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,866.86 : 28,298.65 = 6,386.61 : x
  2. Step 2: Convert to fraction form
    18,866.86/28,298.65 = 6,386.61/x
  3. Step 3: Cross multiply
    18,866.86x = 28,298.65 × 6,386.61
  4. Step 4: Simplify right side
    18,866.86x = 180,732,441.08
  5. Step 5: Solve for x
    x = 180,732,441.08/18,866.86
  6. Step 6: Final answer
    x = 9,579.36

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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.