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Finding the Fourth Proportional to 910.14, 1,365.17 and 260.87

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Solution

The fourth proportional to 910.14, 1,365.17 and 260.87 is: 391.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.14 : 1,365.17 = 260.87 : x
  2. Step 2: Convert to fraction form
    910.14/1,365.17 = 260.87/x
  3. Step 3: Cross multiply
    910.14x = 1,365.17 × 260.87
  4. Step 4: Simplify right side
    910.14x = 356,131.90
  5. Step 5: Solve for x
    x = 356,131.90/910.14
  6. Step 6: Final answer
    x = 391.29

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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.