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Finding the Fourth Proportional to 491.70, 678.72 and 295.32

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Solution

The fourth proportional to 491.70, 678.72 and 295.32 is: 407.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.70 : 678.72 = 295.32 : x
  2. Step 2: Convert to fraction form
    491.70/678.72 = 295.32/x
  3. Step 3: Cross multiply
    491.70x = 678.72 × 295.32
  4. Step 4: Simplify right side
    491.70x = 200,439.59
  5. Step 5: Solve for x
    x = 200,439.59/491.70
  6. Step 6: Final answer
    x = 407.65

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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.