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Finding the Fourth Proportional to 68,386.80, 102,565.80 and 28,945.20

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Solution

The fourth proportional to 68,386.80, 102,565.80 and 28,945.20 is: 43,411.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,386.80 : 102,565.80 = 28,945.20 : x
  2. Step 2: Convert to fraction form
    68,386.80/102,565.80 = 28,945.20/x
  3. Step 3: Cross multiply
    68,386.80x = 102,565.80 × 28,945.20
  4. Step 4: Simplify right side
    68,386.80x = 2,968,787,594.16
  5. Step 5: Solve for x
    x = 2,968,787,594.16/68,386.80
  6. Step 6: Final answer
    x = 43,411.71

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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.