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Finding the Fourth Proportional to 295.20, 407.28 and 211.28

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Solution

The fourth proportional to 295.20, 407.28 and 211.28 is: 291.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    295.20 : 407.28 = 211.28 : x
  2. Step 2: Convert to fraction form
    295.20/407.28 = 211.28/x
  3. Step 3: Cross multiply
    295.20x = 407.28 × 211.28
  4. Step 4: Simplify right side
    295.20x = 86,050.12
  5. Step 5: Solve for x
    x = 86,050.12/295.20
  6. Step 6: Final answer
    x = 291.50

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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.