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Finding the Fourth Proportional to 742.91, 1,118.54 and 612.63

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Solution

The fourth proportional to 742.91, 1,118.54 and 612.63 is: 922.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.91 : 1,118.54 = 612.63 : x
  2. Step 2: Convert to fraction form
    742.91/1,118.54 = 612.63/x
  3. Step 3: Cross multiply
    742.91x = 1,118.54 × 612.63
  4. Step 4: Simplify right side
    742.91x = 685,252.69
  5. Step 5: Solve for x
    x = 685,252.69/742.91
  6. Step 6: Final answer
    x = 922.40

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.