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Finding the Fourth Proportional to 397.90, 549.12 and 345.04

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Solution

The fourth proportional to 397.90, 549.12 and 345.04 is: 476.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.90 : 549.12 = 345.04 : x
  2. Step 2: Convert to fraction form
    397.90/549.12 = 345.04/x
  3. Step 3: Cross multiply
    397.90x = 549.12 × 345.04
  4. Step 4: Simplify right side
    397.90x = 189,468.36
  5. Step 5: Solve for x
    x = 189,468.36/397.90
  6. Step 6: Final answer
    x = 476.17

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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.