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Finding the Fourth Proportional to 287.58, 430.98 and 171.90

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Solution

The fourth proportional to 287.58, 430.98 and 171.90 is: 257.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.58 : 430.98 = 171.90 : x
  2. Step 2: Convert to fraction form
    287.58/430.98 = 171.90/x
  3. Step 3: Cross multiply
    287.58x = 430.98 × 171.90
  4. Step 4: Simplify right side
    287.58x = 74,085.46
  5. Step 5: Solve for x
    x = 74,085.46/287.58
  6. Step 6: Final answer
    x = 257.62

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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.