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Finding the Fourth Proportional to 145.55, 218.16 and 91.46

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Solution

The fourth proportional to 145.55, 218.16 and 91.46 is: 137.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.55 : 218.16 = 91.46 : x
  2. Step 2: Convert to fraction form
    145.55/218.16 = 91.46/x
  3. Step 3: Cross multiply
    145.55x = 218.16 × 91.46
  4. Step 4: Simplify right side
    145.55x = 19,951.82
  5. Step 5: Solve for x
    x = 19,951.82/145.55
  6. Step 6: Final answer
    x = 137.08

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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.