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Finding the Fourth Proportional to 286.74, 430.20 and 140.58

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Solution

The fourth proportional to 286.74, 430.20 and 140.58 is: 210.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.74 : 430.20 = 140.58 : x
  2. Step 2: Convert to fraction form
    286.74/430.20 = 140.58/x
  3. Step 3: Cross multiply
    286.74x = 430.20 × 140.58
  4. Step 4: Simplify right side
    286.74x = 60,477.52
  5. Step 5: Solve for x
    x = 60,477.52/286.74
  6. Step 6: Final answer
    x = 210.91

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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.