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Finding the Fourth Proportional to 2,385.47, 3,578.65 and 905.13

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Solution

The fourth proportional to 2,385.47, 3,578.65 and 905.13 is: 1,357.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,385.47 : 3,578.65 = 905.13 : x
  2. Step 2: Convert to fraction form
    2,385.47/3,578.65 = 905.13/x
  3. Step 3: Cross multiply
    2,385.47x = 3,578.65 × 905.13
  4. Step 4: Simplify right side
    2,385.47x = 3,239,143.47
  5. Step 5: Solve for x
    x = 3,239,143.47/2,385.47
  6. Step 6: Final answer
    x = 1,357.86

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1.5x scale

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.