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Finding the Fourth Proportional to 1,385, 2,077.52 and 411.08

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Solution

The fourth proportional to 1,385, 2,077.52 and 411.08 is: 616.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385 : 2,077.52 = 411.08 : x
  2. Step 2: Convert to fraction form
    1,385/2,077.52 = 411.08/x
  3. Step 3: Cross multiply
    1,385x = 2,077.52 × 411.08
  4. Step 4: Simplify right side
    1,385x = 854,026.92
  5. Step 5: Solve for x
    x = 854,026.92/1,385
  6. Step 6: Final answer
    x = 616.63

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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.