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Finding the Fourth Proportional to 742.66, 1,113.99 and 417.85

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Solution

The fourth proportional to 742.66, 1,113.99 and 417.85 is: 626.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.66 : 1,113.99 = 417.85 : x
  2. Step 2: Convert to fraction form
    742.66/1,113.99 = 417.85/x
  3. Step 3: Cross multiply
    742.66x = 1,113.99 × 417.85
  4. Step 4: Simplify right side
    742.66x = 465,476.37
  5. Step 5: Solve for x
    x = 465,476.37/742.66
  6. Step 6: Final answer
    x = 626.77

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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.