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Finding the Fourth Proportional to 145.34, 200.51 and 87.12

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Solution

The fourth proportional to 145.34, 200.51 and 87.12 is: 120.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.34 : 200.51 = 87.12 : x
  2. Step 2: Convert to fraction form
    145.34/200.51 = 87.12/x
  3. Step 3: Cross multiply
    145.34x = 200.51 × 87.12
  4. Step 4: Simplify right side
    145.34x = 17,468.43
  5. Step 5: Solve for x
    x = 17,468.43/145.34
  6. Step 6: Final answer
    x = 120.19

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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.