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Finding the Fourth Proportional to 155.58, 214.63 and 100.35

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Solution

The fourth proportional to 155.58, 214.63 and 100.35 is: 138.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.58 : 214.63 = 100.35 : x
  2. Step 2: Convert to fraction form
    155.58/214.63 = 100.35/x
  3. Step 3: Cross multiply
    155.58x = 214.63 × 100.35
  4. Step 4: Simplify right side
    155.58x = 21,538.12
  5. Step 5: Solve for x
    x = 21,538.12/155.58
  6. Step 6: Final answer
    x = 138.44

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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.