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Finding the Fourth Proportional to 491.65, 678.49 and 270.61

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Solution

The fourth proportional to 491.65, 678.49 and 270.61 is: 373.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.65 : 678.49 = 270.61 : x
  2. Step 2: Convert to fraction form
    491.65/678.49 = 270.61/x
  3. Step 3: Cross multiply
    491.65x = 678.49 × 270.61
  4. Step 4: Simplify right side
    491.65x = 183,607.88
  5. Step 5: Solve for x
    x = 183,607.88/491.65
  6. Step 6: Final answer
    x = 373.46

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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.