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Finding the Fourth Proportional to 742.35, 1,111.50 and 417.18

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Solution

The fourth proportional to 742.35, 1,111.50 and 417.18 is: 624.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.35 : 1,111.50 = 417.18 : x
  2. Step 2: Convert to fraction form
    742.35/1,111.50 = 417.18/x
  3. Step 3: Cross multiply
    742.35x = 1,111.50 × 417.18
  4. Step 4: Simplify right side
    742.35x = 463,695.57
  5. Step 5: Solve for x
    x = 463,695.57/742.35
  6. Step 6: Final answer
    x = 624.63

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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.