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Finding the Fourth Proportional to 458.74, 687.43 and 342.64

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Solution

The fourth proportional to 458.74, 687.43 and 342.64 is: 513.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.74 : 687.43 = 342.64 : x
  2. Step 2: Convert to fraction form
    458.74/687.43 = 342.64/x
  3. Step 3: Cross multiply
    458.74x = 687.43 × 342.64
  4. Step 4: Simplify right side
    458.74x = 235,541.02
  5. Step 5: Solve for x
    x = 235,541.02/458.74
  6. Step 6: Final answer
    x = 513.45

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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.