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Finding the Fourth Proportional to 458.42, 687.30 and 214.80

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Solution

The fourth proportional to 458.42, 687.30 and 214.80 is: 322.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.42 : 687.30 = 214.80 : x
  2. Step 2: Convert to fraction form
    458.42/687.30 = 214.80/x
  3. Step 3: Cross multiply
    458.42x = 687.30 × 214.80
  4. Step 4: Simplify right side
    458.42x = 147,632.04
  5. Step 5: Solve for x
    x = 147,632.04/458.42
  6. Step 6: Final answer
    x = 322.05

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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.