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Finding the Fourth Proportional to 1,135.68, 1,703.30 and 405.14

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Solution

The fourth proportional to 1,135.68, 1,703.30 and 405.14 is: 607.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.68 : 1,703.30 = 405.14 : x
  2. Step 2: Convert to fraction form
    1,135.68/1,703.30 = 405.14/x
  3. Step 3: Cross multiply
    1,135.68x = 1,703.30 × 405.14
  4. Step 4: Simplify right side
    1,135.68x = 690,074.96
  5. Step 5: Solve for x
    x = 690,074.96/1,135.68
  6. Step 6: Final answer
    x = 607.63

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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.