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Finding the Fourth Proportional to 4,221, 6,331.50 and 1,143

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Solution

The fourth proportional to 4,221, 6,331.50 and 1,143 is: 1,714.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,221 : 6,331.50 = 1,143 : x
  2. Step 2: Convert to fraction form
    4,221/6,331.50 = 1,143/x
  3. Step 3: Cross multiply
    4,221x = 6,331.50 × 1,143
  4. Step 4: Simplify right side
    4,221x = 7,236,904.50
  5. Step 5: Solve for x
    x = 7,236,904.50/4,221
  6. Step 6: Final answer
    x = 1,714.50

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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.