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Finding the Fourth Proportional to 916.55, 1,374.39 and 396.53

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Solution

The fourth proportional to 916.55, 1,374.39 and 396.53 is: 594.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.55 : 1,374.39 = 396.53 : x
  2. Step 2: Convert to fraction form
    916.55/1,374.39 = 396.53/x
  3. Step 3: Cross multiply
    916.55x = 1,374.39 × 396.53
  4. Step 4: Simplify right side
    916.55x = 544,986.87
  5. Step 5: Solve for x
    x = 544,986.87/916.55
  6. Step 6: Final answer
    x = 594.61

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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.