Home / 428,221.71-642,342.96-143,916.39

Finding the Fourth Proportional to 428,221.71, 642,342.96 and 143,916.39

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Solution

The fourth proportional to 428,221.71, 642,342.96 and 143,916.39 is: 215,878.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,221.71 : 642,342.96 = 143,916.39 : x
  2. Step 2: Convert to fraction form
    428,221.71/642,342.96 = 143,916.39/x
  3. Step 3: Cross multiply
    428,221.71x = 642,342.96 × 143,916.39
  4. Step 4: Simplify right side
    428,221.71x = 92,443,679,945.11
  5. Step 5: Solve for x
    x = 92,443,679,945.11/428,221.71
  6. Step 6: Final answer
    x = 215,878.08

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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.