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Finding the Fourth Proportional to 143.04, 214.32 and 91.47

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Solution

The fourth proportional to 143.04, 214.32 and 91.47 is: 137.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.04 : 214.32 = 91.47 : x
  2. Step 2: Convert to fraction form
    143.04/214.32 = 91.47/x
  3. Step 3: Cross multiply
    143.04x = 214.32 × 91.47
  4. Step 4: Simplify right side
    143.04x = 19,603.85
  5. Step 5: Solve for x
    x = 19,603.85/143.04
  6. Step 6: Final answer
    x = 137.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.