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Finding the Fourth Proportional to 286.39, 430.35 and 156.49

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Solution

The fourth proportional to 286.39, 430.35 and 156.49 is: 235.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.39 : 430.35 = 156.49 : x
  2. Step 2: Convert to fraction form
    286.39/430.35 = 156.49/x
  3. Step 3: Cross multiply
    286.39x = 430.35 × 156.49
  4. Step 4: Simplify right side
    286.39x = 67,344.40
  5. Step 5: Solve for x
    x = 67,344.40/286.39
  6. Step 6: Final answer
    x = 235.15

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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.