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Finding the Fourth Proportional to 491.16, 678.13 and 304.95

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Solution

The fourth proportional to 491.16, 678.13 and 304.95 is: 421.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.16 : 678.13 = 304.95 : x
  2. Step 2: Convert to fraction form
    491.16/678.13 = 304.95/x
  3. Step 3: Cross multiply
    491.16x = 678.13 × 304.95
  4. Step 4: Simplify right side
    491.16x = 206,795.74
  5. Step 5: Solve for x
    x = 206,795.74/491.16
  6. Step 6: Final answer
    x = 421.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.