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Finding the Fourth Proportional to 145.64, 200.99 and 87.42

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Solution

The fourth proportional to 145.64, 200.99 and 87.42 is: 120.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.64 : 200.99 = 87.42 : x
  2. Step 2: Convert to fraction form
    145.64/200.99 = 87.42/x
  3. Step 3: Cross multiply
    145.64x = 200.99 × 87.42
  4. Step 4: Simplify right side
    145.64x = 17,570.86
  5. Step 5: Solve for x
    x = 17,570.86/145.64
  6. Step 6: Final answer
    x = 120.64

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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.