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Finding the Fourth Proportional to 287.03, 430.70 and 113.79

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Solution

The fourth proportional to 287.03, 430.70 and 113.79 is: 170.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.03 : 430.70 = 113.79 : x
  2. Step 2: Convert to fraction form
    287.03/430.70 = 113.79/x
  3. Step 3: Cross multiply
    287.03x = 430.70 × 113.79
  4. Step 4: Simplify right side
    287.03x = 49,009.35
  5. Step 5: Solve for x
    x = 49,009.35/287.03
  6. Step 6: Final answer
    x = 170.75

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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.