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Finding the Fourth Proportional to 458.68, 688.19 and 276.20

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Solution

The fourth proportional to 458.68, 688.19 and 276.20 is: 414.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.68 : 688.19 = 276.20 : x
  2. Step 2: Convert to fraction form
    458.68/688.19 = 276.20/x
  3. Step 3: Cross multiply
    458.68x = 688.19 × 276.20
  4. Step 4: Simplify right side
    458.68x = 190,078.08
  5. Step 5: Solve for x
    x = 190,078.08/458.68
  6. Step 6: Final answer
    x = 414.40

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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.