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Finding the Fourth Proportional to 1,141.89, 1,712.85 and 411.45

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Solution

The fourth proportional to 1,141.89, 1,712.85 and 411.45 is: 617.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.89 : 1,712.85 = 411.45 : x
  2. Step 2: Convert to fraction form
    1,141.89/1,712.85 = 411.45/x
  3. Step 3: Cross multiply
    1,141.89x = 1,712.85 × 411.45
  4. Step 4: Simplify right side
    1,141.89x = 704,752.13
  5. Step 5: Solve for x
    x = 704,752.13/1,141.89
  6. Step 6: Final answer
    x = 617.18

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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.