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Finding the Fourth Proportional to 911.96, 1,368.76 and 853.64

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Solution

The fourth proportional to 911.96, 1,368.76 and 853.64 is: 1,281.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.96 : 1,368.76 = 853.64 : x
  2. Step 2: Convert to fraction form
    911.96/1,368.76 = 853.64/x
  3. Step 3: Cross multiply
    911.96x = 1,368.76 × 853.64
  4. Step 4: Simplify right side
    911.96x = 1,168,428.29
  5. Step 5: Solve for x
    x = 1,168,428.29/911.96
  6. Step 6: Final answer
    x = 1,281.23

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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.