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Finding the Fourth Proportional to 456.76, 685.03 and 340.81

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Solution

The fourth proportional to 456.76, 685.03 and 340.81 is: 511.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.76 : 685.03 = 340.81 : x
  2. Step 2: Convert to fraction form
    456.76/685.03 = 340.81/x
  3. Step 3: Cross multiply
    456.76x = 685.03 × 340.81
  4. Step 4: Simplify right side
    456.76x = 233,464.11
  5. Step 5: Solve for x
    x = 233,464.11/456.76
  6. Step 6: Final answer
    x = 511.13

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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.