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Finding the Fourth Proportional to 145.04, 200.16 and 121.68

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Solution

The fourth proportional to 145.04, 200.16 and 121.68 is: 167.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.04 : 200.16 = 121.68 : x
  2. Step 2: Convert to fraction form
    145.04/200.16 = 121.68/x
  3. Step 3: Cross multiply
    145.04x = 200.16 × 121.68
  4. Step 4: Simplify right side
    145.04x = 24,355.47
  5. Step 5: Solve for x
    x = 24,355.47/145.04
  6. Step 6: Final answer
    x = 167.93

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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.