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Finding the Fourth Proportional to 145.60, 218.08 and 91.36

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Solution

The fourth proportional to 145.60, 218.08 and 91.36 is: 136.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.60 : 218.08 = 91.36 : x
  2. Step 2: Convert to fraction form
    145.60/218.08 = 91.36/x
  3. Step 3: Cross multiply
    145.60x = 218.08 × 91.36
  4. Step 4: Simplify right side
    145.60x = 19,923.79
  5. Step 5: Solve for x
    x = 19,923.79/145.60
  6. Step 6: Final answer
    x = 136.84

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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.