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Finding the Fourth Proportional to 155.63, 214.76 and 85.69

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Solution

The fourth proportional to 155.63, 214.76 and 85.69 is: 118.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.63 : 214.76 = 85.69 : x
  2. Step 2: Convert to fraction form
    155.63/214.76 = 85.69/x
  3. Step 3: Cross multiply
    155.63x = 214.76 × 85.69
  4. Step 4: Simplify right side
    155.63x = 18,401.71
  5. Step 5: Solve for x
    x = 18,401.71/155.63
  6. Step 6: Final answer
    x = 118.24

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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.