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Finding the Fourth Proportional to 294.48, 405.18 and 287.28

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Solution

The fourth proportional to 294.48, 405.18 and 287.28 is: 395.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    294.48 : 405.18 = 287.28 : x
  2. Step 2: Convert to fraction form
    294.48/405.18 = 287.28/x
  3. Step 3: Cross multiply
    294.48x = 405.18 × 287.28
  4. Step 4: Simplify right side
    294.48x = 116,400.11
  5. Step 5: Solve for x
    x = 116,400.11/294.48
  6. Step 6: Final answer
    x = 395.27

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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.