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Finding the Fourth Proportional to 458.05, 687.90 and 401.35

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Solution

The fourth proportional to 458.05, 687.90 and 401.35 is: 602.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.05 : 687.90 = 401.35 : x
  2. Step 2: Convert to fraction form
    458.05/687.90 = 401.35/x
  3. Step 3: Cross multiply
    458.05x = 687.90 × 401.35
  4. Step 4: Simplify right side
    458.05x = 276,088.67
  5. Step 5: Solve for x
    x = 276,088.67/458.05
  6. Step 6: Final answer
    x = 602.75

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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.