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Finding the Fourth Proportional to 456.40, 684.15 and 239.77

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Solution

The fourth proportional to 456.40, 684.15 and 239.77 is: 359.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.40 : 684.15 = 239.77 : x
  2. Step 2: Convert to fraction form
    456.40/684.15 = 239.77/x
  3. Step 3: Cross multiply
    456.40x = 684.15 × 239.77
  4. Step 4: Simplify right side
    456.40x = 164,038.65
  5. Step 5: Solve for x
    x = 164,038.65/456.40
  6. Step 6: Final answer
    x = 359.42

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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.