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Finding the Fourth Proportional to 145.40, 200.68 and 86.40

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Solution

The fourth proportional to 145.40, 200.68 and 86.40 is: 119.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.40 : 200.68 = 86.40 : x
  2. Step 2: Convert to fraction form
    145.40/200.68 = 86.40/x
  3. Step 3: Cross multiply
    145.40x = 200.68 × 86.40
  4. Step 4: Simplify right side
    145.40x = 17,338.54
  5. Step 5: Solve for x
    x = 17,338.54/145.40
  6. Step 6: Final answer
    x = 119.25

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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.