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Finding the Fourth Proportional to 1,212.68, 1,818.98 and 432.66

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Solution

The fourth proportional to 1,212.68, 1,818.98 and 432.66 is: 648.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.68 : 1,818.98 = 432.66 : x
  2. Step 2: Convert to fraction form
    1,212.68/1,818.98 = 432.66/x
  3. Step 3: Cross multiply
    1,212.68x = 1,818.98 × 432.66
  4. Step 4: Simplify right side
    1,212.68x = 786,999.89
  5. Step 5: Solve for x
    x = 786,999.89/1,212.68
  6. Step 6: Final answer
    x = 648.98

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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.