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Finding the Fourth Proportional to 145.15, 200.30 and 79.65

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Solution

The fourth proportional to 145.15, 200.30 and 79.65 is: 109.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.15 : 200.30 = 79.65 : x
  2. Step 2: Convert to fraction form
    145.15/200.30 = 79.65/x
  3. Step 3: Cross multiply
    145.15x = 200.30 × 79.65
  4. Step 4: Simplify right side
    145.15x = 15,953.90
  5. Step 5: Solve for x
    x = 15,953.90/145.15
  6. Step 6: Final answer
    x = 109.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.