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Finding the Fourth Proportional to 612.48, 916.26 and 491

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Solution

The fourth proportional to 612.48, 916.26 and 491 is: 734.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.48 : 916.26 = 491 : x
  2. Step 2: Convert to fraction form
    612.48/916.26 = 491/x
  3. Step 3: Cross multiply
    612.48x = 916.26 × 491
  4. Step 4: Simplify right side
    612.48x = 449,883.66
  5. Step 5: Solve for x
    x = 449,883.66/612.48
  6. Step 6: Final answer
    x = 734.53

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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.