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Finding the Fourth Proportional to 145.25, 216.72 and 136.50

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Solution

The fourth proportional to 145.25, 216.72 and 136.50 is: 203.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.25 : 216.72 = 136.50 : x
  2. Step 2: Convert to fraction form
    145.25/216.72 = 136.50/x
  3. Step 3: Cross multiply
    145.25x = 216.72 × 136.50
  4. Step 4: Simplify right side
    145.25x = 29,582.28
  5. Step 5: Solve for x
    x = 29,582.28/145.25
  6. Step 6: Final answer
    x = 203.67

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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.