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Finding the Fourth Proportional to 145.80, 217.80 and 129.60

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Solution

The fourth proportional to 145.80, 217.80 and 129.60 is: 193.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.80 : 217.80 = 129.60 : x
  2. Step 2: Convert to fraction form
    145.80/217.80 = 129.60/x
  3. Step 3: Cross multiply
    145.80x = 217.80 × 129.60
  4. Step 4: Simplify right side
    145.80x = 28,226.88
  5. Step 5: Solve for x
    x = 28,226.88/145.80
  6. Step 6: Final answer
    x = 193.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.