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Finding the Fourth Proportional to 168,919.65, 253,233.68 and 85,813.65

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Solution

The fourth proportional to 168,919.65, 253,233.68 and 85,813.65 is: 128,646.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    168,919.65 : 253,233.68 = 85,813.65 : x
  2. Step 2: Convert to fraction form
    168,919.65/253,233.68 = 85,813.65/x
  3. Step 3: Cross multiply
    168,919.65x = 253,233.68 × 85,813.65
  4. Step 4: Simplify right side
    168,919.65x = 21,730,905,954.66
  5. Step 5: Solve for x
    x = 21,730,905,954.66/168,919.65
  6. Step 6: Final answer
    x = 128,646.41

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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.