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Finding the Fourth Proportional to 145.29, 200.52 and 87.15

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Solution

The fourth proportional to 145.29, 200.52 and 87.15 is: 120.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.29 : 200.52 = 87.15 : x
  2. Step 2: Convert to fraction form
    145.29/200.52 = 87.15/x
  3. Step 3: Cross multiply
    145.29x = 200.52 × 87.15
  4. Step 4: Simplify right side
    145.29x = 17,475.32
  5. Step 5: Solve for x
    x = 17,475.32/145.29
  6. Step 6: Final answer
    x = 120.28

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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.