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Finding the Fourth Proportional to 1,243.61, 1,864.87 and 421.66

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Solution

The fourth proportional to 1,243.61, 1,864.87 and 421.66 is: 632.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.61 : 1,864.87 = 421.66 : x
  2. Step 2: Convert to fraction form
    1,243.61/1,864.87 = 421.66/x
  3. Step 3: Cross multiply
    1,243.61x = 1,864.87 × 421.66
  4. Step 4: Simplify right side
    1,243.61x = 786,335.37
  5. Step 5: Solve for x
    x = 786,335.37/1,243.61
  6. Step 6: Final answer
    x = 632.30

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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.