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Finding the Fourth Proportional to 916, 1,374.60 and 403

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Solution

The fourth proportional to 916, 1,374.60 and 403 is: 604.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    916 : 1,374.60 = 403 : x
  2. Step 2: Convert to fraction form
    916/1,374.60 = 403/x
  3. Step 3: Cross multiply
    916x = 1,374.60 × 403
  4. Step 4: Simplify right side
    916x = 553,963.80
  5. Step 5: Solve for x
    x = 553,963.80/916
  6. Step 6: Final answer
    x = 604.76

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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.