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Finding the Fourth Proportional to 917.30, 1,374.92 and 397.74

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Solution

The fourth proportional to 917.30, 1,374.92 and 397.74 is: 596.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.30 : 1,374.92 = 397.74 : x
  2. Step 2: Convert to fraction form
    917.30/1,374.92 = 397.74/x
  3. Step 3: Cross multiply
    917.30x = 1,374.92 × 397.74
  4. Step 4: Simplify right side
    917.30x = 546,855.98
  5. Step 5: Solve for x
    x = 546,855.98/917.30
  6. Step 6: Final answer
    x = 596.16

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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.