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Finding the Fourth Proportional to 399,374.34, 551,132.28 and 218,085.72

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Solution

The fourth proportional to 399,374.34, 551,132.28 and 218,085.72 is: 300,955.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,374.34 : 551,132.28 = 218,085.72 : x
  2. Step 2: Convert to fraction form
    399,374.34/551,132.28 = 218,085.72/x
  3. Step 3: Cross multiply
    399,374.34x = 551,132.28 × 218,085.72
  4. Step 4: Simplify right side
    399,374.34x = 120,194,080,099.04
  5. Step 5: Solve for x
    x = 120,194,080,099.04/399,374.34
  6. Step 6: Final answer
    x = 300,955.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.