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Finding the Fourth Proportional to 287.60, 430.71 and 170.15

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Solution

The fourth proportional to 287.60, 430.71 and 170.15 is: 254.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.60 : 430.71 = 170.15 : x
  2. Step 2: Convert to fraction form
    287.60/430.71 = 170.15/x
  3. Step 3: Cross multiply
    287.60x = 430.71 × 170.15
  4. Step 4: Simplify right side
    287.60x = 73,283.15
  5. Step 5: Solve for x
    x = 73,283.15/287.60
  6. Step 6: Final answer
    x = 254.81

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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.