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Finding the Fourth Proportional to 287.59, 396.88 and 156.60

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Solution

The fourth proportional to 287.59, 396.88 and 156.60 is: 216.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.59 : 396.88 = 156.60 : x
  2. Step 2: Convert to fraction form
    287.59/396.88 = 156.60/x
  3. Step 3: Cross multiply
    287.59x = 396.88 × 156.60
  4. Step 4: Simplify right side
    287.59x = 62,152.27
  5. Step 5: Solve for x
    x = 62,152.27/287.59
  6. Step 6: Final answer
    x = 216.11

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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.