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Finding the Fourth Proportional to 287.70, 431.60 and 215.52

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Solution

The fourth proportional to 287.70, 431.60 and 215.52 is: 323.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.70 : 431.60 = 215.52 : x
  2. Step 2: Convert to fraction form
    287.70/431.60 = 215.52/x
  3. Step 3: Cross multiply
    287.70x = 431.60 × 215.52
  4. Step 4: Simplify right side
    287.70x = 93,017.35
  5. Step 5: Solve for x
    x = 93,017.35/287.70
  6. Step 6: Final answer
    x = 323.31

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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.