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Finding the Fourth Proportional to 491.50, 678.33 and 284.50

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Solution

The fourth proportional to 491.50, 678.33 and 284.50 is: 392.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.50 : 678.33 = 284.50 : x
  2. Step 2: Convert to fraction form
    491.50/678.33 = 284.50/x
  3. Step 3: Cross multiply
    491.50x = 678.33 × 284.50
  4. Step 4: Simplify right side
    491.50x = 192,984.89
  5. Step 5: Solve for x
    x = 192,984.89/491.50
  6. Step 6: Final answer
    x = 392.64

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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.