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Finding the Fourth Proportional to 911.98, 1,368.78 and 425.17

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Solution

The fourth proportional to 911.98, 1,368.78 and 425.17 is: 638.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.98 : 1,368.78 = 425.17 : x
  2. Step 2: Convert to fraction form
    911.98/1,368.78 = 425.17/x
  3. Step 3: Cross multiply
    911.98x = 1,368.78 × 425.17
  4. Step 4: Simplify right side
    911.98x = 581,964.19
  5. Step 5: Solve for x
    x = 581,964.19/911.98
  6. Step 6: Final answer
    x = 638.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.