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Finding the Fourth Proportional to 385,107.81, 531,407.85 and 212,998.41

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Solution

The fourth proportional to 385,107.81, 531,407.85 and 212,998.41 is: 293,915.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,107.81 : 531,407.85 = 212,998.41 : x
  2. Step 2: Convert to fraction form
    385,107.81/531,407.85 = 212,998.41/x
  3. Step 3: Cross multiply
    385,107.81x = 531,407.85 × 212,998.41
  4. Step 4: Simplify right side
    385,107.81x = 113,189,027,111.52
  5. Step 5: Solve for x
    x = 113,189,027,111.52/385,107.81
  6. Step 6: Final answer
    x = 293,915.17

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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.