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Finding the Fourth Proportional to 145.55, 200.79 and 87.32

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Solution

The fourth proportional to 145.55, 200.79 and 87.32 is: 120.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.55 : 200.79 = 87.32 : x
  2. Step 2: Convert to fraction form
    145.55/200.79 = 87.32/x
  3. Step 3: Cross multiply
    145.55x = 200.79 × 87.32
  4. Step 4: Simplify right side
    145.55x = 17,532.98
  5. Step 5: Solve for x
    x = 17,532.98/145.55
  6. Step 6: Final answer
    x = 120.46

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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.