Home / 378,905.80-522,889.68-209,139.52

Finding the Fourth Proportional to 378,905.80, 522,889.68 and 209,139.52

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Solution

The fourth proportional to 378,905.80, 522,889.68 and 209,139.52 is: 288,612.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,905.80 : 522,889.68 = 209,139.52 : x
  2. Step 2: Convert to fraction form
    378,905.80/522,889.68 = 209,139.52/x
  3. Step 3: Cross multiply
    378,905.80x = 522,889.68 × 209,139.52
  4. Step 4: Simplify right side
    378,905.80x = 109,356,896,688.15
  5. Step 5: Solve for x
    x = 109,356,896,688.15/378,905.80
  6. Step 6: Final answer
    x = 288,612.36

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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.