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Finding the Fourth Proportional to 145.59, 217.80 and 129.35

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Solution

The fourth proportional to 145.59, 217.80 and 129.35 is: 193.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.59 : 217.80 = 129.35 : x
  2. Step 2: Convert to fraction form
    145.59/217.80 = 129.35/x
  3. Step 3: Cross multiply
    145.59x = 217.80 × 129.35
  4. Step 4: Simplify right side
    145.59x = 28,171.34
  5. Step 5: Solve for x
    x = 28,171.34/145.59
  6. Step 6: Final answer
    x = 193.50

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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.