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Finding the Fourth Proportional to 266.68, 368.05 and 156.20

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Solution

The fourth proportional to 266.68, 368.05 and 156.20 is: 215.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.68 : 368.05 = 156.20 : x
  2. Step 2: Convert to fraction form
    266.68/368.05 = 156.20/x
  3. Step 3: Cross multiply
    266.68x = 368.05 × 156.20
  4. Step 4: Simplify right side
    266.68x = 57,489.41
  5. Step 5: Solve for x
    x = 57,489.41/266.68
  6. Step 6: Final answer
    x = 215.57

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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.