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Finding the Fourth Proportional to 491.66, 678.59 and 281.87

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Solution

The fourth proportional to 491.66, 678.59 and 281.87 is: 389.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.66 : 678.59 = 281.87 : x
  2. Step 2: Convert to fraction form
    491.66/678.59 = 281.87/x
  3. Step 3: Cross multiply
    491.66x = 678.59 × 281.87
  4. Step 4: Simplify right side
    491.66x = 191,274.55
  5. Step 5: Solve for x
    x = 191,274.55/491.66
  6. Step 6: Final answer
    x = 389.04

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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.