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Finding the Fourth Proportional to 491.68, 678.58 and 284.68

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Solution

The fourth proportional to 491.68, 678.58 and 284.68 is: 392.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.68 : 678.58 = 284.68 : x
  2. Step 2: Convert to fraction form
    491.68/678.58 = 284.68/x
  3. Step 3: Cross multiply
    491.68x = 678.58 × 284.68
  4. Step 4: Simplify right side
    491.68x = 193,178.15
  5. Step 5: Solve for x
    x = 193,178.15/491.68
  6. Step 6: Final answer
    x = 392.89

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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.