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Finding the Fourth Proportional to 288.25, 430.32 and 278.12

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Solution

The fourth proportional to 288.25, 430.32 and 278.12 is: 415.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.25 : 430.32 = 278.12 : x
  2. Step 2: Convert to fraction form
    288.25/430.32 = 278.12/x
  3. Step 3: Cross multiply
    288.25x = 430.32 × 278.12
  4. Step 4: Simplify right side
    288.25x = 119,679.21
  5. Step 5: Solve for x
    x = 119,679.21/288.25
  6. Step 6: Final answer
    x = 415.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.