Home / 378,905.58-522,886.86-209,139.66

Finding the Fourth Proportional to 378,905.58, 522,886.86 and 209,139.66

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Solution

The fourth proportional to 378,905.58, 522,886.86 and 209,139.66 is: 288,611.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,905.58 : 522,886.86 = 209,139.66 : x
  2. Step 2: Convert to fraction form
    378,905.58/522,886.86 = 209,139.66/x
  3. Step 3: Cross multiply
    378,905.58x = 522,886.86 × 209,139.66
  4. Step 4: Simplify right side
    378,905.58x = 109,356,380,118.87
  5. Step 5: Solve for x
    x = 109,356,380,118.87/378,905.58
  6. Step 6: Final answer
    x = 288,611.16

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1.5x scale

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.