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Finding the Fourth Proportional to 431.76, 647.63 and 143.18

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Solution

The fourth proportional to 431.76, 647.63 and 143.18 is: 214.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.76 : 647.63 = 143.18 : x
  2. Step 2: Convert to fraction form
    431.76/647.63 = 143.18/x
  3. Step 3: Cross multiply
    431.76x = 647.63 × 143.18
  4. Step 4: Simplify right side
    431.76x = 92,727.66
  5. Step 5: Solve for x
    x = 92,727.66/431.76
  6. Step 6: Final answer
    x = 214.77

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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.