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Finding the Fourth Proportional to 258,547.20, 387,661.92 and 100,591.68

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Solution

The fourth proportional to 258,547.20, 387,661.92 and 100,591.68 is: 150,825.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,547.20 : 387,661.92 = 100,591.68 : x
  2. Step 2: Convert to fraction form
    258,547.20/387,661.92 = 100,591.68/x
  3. Step 3: Cross multiply
    258,547.20x = 387,661.92 × 100,591.68
  4. Step 4: Simplify right side
    258,547.20x = 38,995,563,804.83
  5. Step 5: Solve for x
    x = 38,995,563,804.83/258,547.20
  6. Step 6: Final answer
    x = 150,825.71

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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.