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Finding the Fourth Proportional to 287.89, 397.28 and 156.89

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Solution

The fourth proportional to 287.89, 397.28 and 156.89 is: 216.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.89 : 397.28 = 156.89 : x
  2. Step 2: Convert to fraction form
    287.89/397.28 = 156.89/x
  3. Step 3: Cross multiply
    287.89x = 397.28 × 156.89
  4. Step 4: Simplify right side
    287.89x = 62,330.64
  5. Step 5: Solve for x
    x = 62,330.64/287.89
  6. Step 6: Final answer
    x = 216.51

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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.