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Finding the Fourth Proportional to 288.40, 432.61 and 71.99

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Solution

The fourth proportional to 288.40, 432.61 and 71.99 is: 107.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.40 : 432.61 = 71.99 : x
  2. Step 2: Convert to fraction form
    288.40/432.61 = 71.99/x
  3. Step 3: Cross multiply
    288.40x = 432.61 × 71.99
  4. Step 4: Simplify right side
    288.40x = 31,143.59
  5. Step 5: Solve for x
    x = 31,143.59/288.40
  6. Step 6: Final answer
    x = 107.99

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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.