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Finding the Fourth Proportional to 1,312.78, 1,969.38 and 491.17

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Solution

The fourth proportional to 1,312.78, 1,969.38 and 491.17 is: 736.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.78 : 1,969.38 = 491.17 : x
  2. Step 2: Convert to fraction form
    1,312.78/1,969.38 = 491.17/x
  3. Step 3: Cross multiply
    1,312.78x = 1,969.38 × 491.17
  4. Step 4: Simplify right side
    1,312.78x = 967,297.92
  5. Step 5: Solve for x
    x = 967,297.92/1,312.78
  6. Step 6: Final answer
    x = 736.83

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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.