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Finding the Fourth Proportional to 208.40, 287.64 and 153.32

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Solution

The fourth proportional to 208.40, 287.64 and 153.32 is: 211.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.40 : 287.64 = 153.32 : x
  2. Step 2: Convert to fraction form
    208.40/287.64 = 153.32/x
  3. Step 3: Cross multiply
    208.40x = 287.64 × 153.32
  4. Step 4: Simplify right side
    208.40x = 44,100.96
  5. Step 5: Solve for x
    x = 44,100.96/208.40
  6. Step 6: Final answer
    x = 211.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.