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Finding the Fourth Proportional to 1,385.39, 2,078.84 and 461.22

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Solution

The fourth proportional to 1,385.39, 2,078.84 and 461.22 is: 692.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.39 : 2,078.84 = 461.22 : x
  2. Step 2: Convert to fraction form
    1,385.39/2,078.84 = 461.22/x
  3. Step 3: Cross multiply
    1,385.39x = 2,078.84 × 461.22
  4. Step 4: Simplify right side
    1,385.39x = 958,800.28
  5. Step 5: Solve for x
    x = 958,800.28/1,385.39
  6. Step 6: Final answer
    x = 692.08

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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.