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Finding the Fourth Proportional to 288.19, 432.28 and 71.77

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Solution

The fourth proportional to 288.19, 432.28 and 71.77 is: 107.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.19 : 432.28 = 71.77 : x
  2. Step 2: Convert to fraction form
    288.19/432.28 = 71.77/x
  3. Step 3: Cross multiply
    288.19x = 432.28 × 71.77
  4. Step 4: Simplify right side
    288.19x = 31,022.63
  5. Step 5: Solve for x
    x = 31,022.63/288.19
  6. Step 6: Final answer
    x = 107.65

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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.