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Finding the Fourth Proportional to 356.66, 534.83 and 128.50

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Solution

The fourth proportional to 356.66, 534.83 and 128.50 is: 192.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.66 : 534.83 = 128.50 : x
  2. Step 2: Convert to fraction form
    356.66/534.83 = 128.50/x
  3. Step 3: Cross multiply
    356.66x = 534.83 × 128.50
  4. Step 4: Simplify right side
    356.66x = 68,725.66
  5. Step 5: Solve for x
    x = 68,725.66/356.66
  6. Step 6: Final answer
    x = 192.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.