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Finding the Fourth Proportional to 145.72, 218.58 and 68.65

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Solution

The fourth proportional to 145.72, 218.58 and 68.65 is: 102.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.72 : 218.58 = 68.65 : x
  2. Step 2: Convert to fraction form
    145.72/218.58 = 68.65/x
  3. Step 3: Cross multiply
    145.72x = 218.58 × 68.65
  4. Step 4: Simplify right side
    145.72x = 15,005.52
  5. Step 5: Solve for x
    x = 15,005.52/145.72
  6. Step 6: Final answer
    x = 102.98

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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.