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Finding the Fourth Proportional to 633.77, 874.67 and 397.90

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Solution

The fourth proportional to 633.77, 874.67 and 397.90 is: 549.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.77 : 874.67 = 397.90 : x
  2. Step 2: Convert to fraction form
    633.77/874.67 = 397.90/x
  3. Step 3: Cross multiply
    633.77x = 874.67 × 397.90
  4. Step 4: Simplify right side
    633.77x = 348,030.30
  5. Step 5: Solve for x
    x = 348,030.30/633.77
  6. Step 6: Final answer
    x = 549.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.