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Finding the Fourth Proportional to 145.09, 200.12 and 89.85

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Solution

The fourth proportional to 145.09, 200.12 and 89.85 is: 123.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.09 : 200.12 = 89.85 : x
  2. Step 2: Convert to fraction form
    145.09/200.12 = 89.85/x
  3. Step 3: Cross multiply
    145.09x = 200.12 × 89.85
  4. Step 4: Simplify right side
    145.09x = 17,981.76
  5. Step 5: Solve for x
    x = 17,981.76/145.09
  6. Step 6: Final answer
    x = 123.94

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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.