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Finding the Fourth Proportional to 145.13, 200.09 and 100.87

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Solution

The fourth proportional to 145.13, 200.09 and 100.87 is: 139.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.13 : 200.09 = 100.87 : x
  2. Step 2: Convert to fraction form
    145.13/200.09 = 100.87/x
  3. Step 3: Cross multiply
    145.13x = 200.09 × 100.87
  4. Step 4: Simplify right side
    145.13x = 20,182.83
  5. Step 5: Solve for x
    x = 20,182.83/145.13
  6. Step 6: Final answer
    x = 139.07

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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.