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Finding the Fourth Proportional to 385,443.74, 531,913.02 and 215,678

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Solution

The fourth proportional to 385,443.74, 531,913.02 and 215,678 is: 297,636.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,443.74 : 531,913.02 = 215,678 : x
  2. Step 2: Convert to fraction form
    385,443.74/531,913.02 = 215,678/x
  3. Step 3: Cross multiply
    385,443.74x = 531,913.02 × 215,678
  4. Step 4: Simplify right side
    385,443.74x = 114,721,936,327.56
  5. Step 5: Solve for x
    x = 114,721,936,327.56/385,443.74
  6. Step 6: Final answer
    x = 297,636.01

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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.