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Finding the Fourth Proportional to 304.34, 456.80 and 139.90

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Solution

The fourth proportional to 304.34, 456.80 and 139.90 is: 209.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.34 : 456.80 = 139.90 : x
  2. Step 2: Convert to fraction form
    304.34/456.80 = 139.90/x
  3. Step 3: Cross multiply
    304.34x = 456.80 × 139.90
  4. Step 4: Simplify right side
    304.34x = 63,904.48
  5. Step 5: Solve for x
    x = 63,904.48/304.34
  6. Step 6: Final answer
    x = 209.98

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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.