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Finding the Fourth Proportional to 287.96, 432.20 and 143.76

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Solution

The fourth proportional to 287.96, 432.20 and 143.76 is: 215.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.96 : 432.20 = 143.76 : x
  2. Step 2: Convert to fraction form
    287.96/432.20 = 143.76/x
  3. Step 3: Cross multiply
    287.96x = 432.20 × 143.76
  4. Step 4: Simplify right side
    287.96x = 62,133.07
  5. Step 5: Solve for x
    x = 62,133.07/287.96
  6. Step 6: Final answer
    x = 215.77

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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.