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Finding the Fourth Proportional to 266.90, 368.35 and 156.43

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Solution

The fourth proportional to 266.90, 368.35 and 156.43 is: 215.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.90 : 368.35 = 156.43 : x
  2. Step 2: Convert to fraction form
    266.90/368.35 = 156.43/x
  3. Step 3: Cross multiply
    266.90x = 368.35 × 156.43
  4. Step 4: Simplify right side
    266.90x = 57,621.06
  5. Step 5: Solve for x
    x = 57,621.06/266.90
  6. Step 6: Final answer
    x = 215.89

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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.