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Finding the Fourth Proportional to 611.42, 916.16 and 489.64

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Solution

The fourth proportional to 611.42, 916.16 and 489.64 is: 733.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.42 : 916.16 = 489.64 : x
  2. Step 2: Convert to fraction form
    611.42/916.16 = 489.64/x
  3. Step 3: Cross multiply
    611.42x = 916.16 × 489.64
  4. Step 4: Simplify right side
    611.42x = 448,588.58
  5. Step 5: Solve for x
    x = 448,588.58/611.42
  6. Step 6: Final answer
    x = 733.68

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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.