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Finding the Fourth Proportional to 155.55, 214.54 and 100.30

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Solution

The fourth proportional to 155.55, 214.54 and 100.30 is: 138.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.55 : 214.54 = 100.30 : x
  2. Step 2: Convert to fraction form
    155.55/214.54 = 100.30/x
  3. Step 3: Cross multiply
    155.55x = 214.54 × 100.30
  4. Step 4: Simplify right side
    155.55x = 21,518.36
  5. Step 5: Solve for x
    x = 21,518.36/155.55
  6. Step 6: Final answer
    x = 138.34

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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.