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Finding the Fourth Proportional to 378,010.80, 521,672.40 and 257,288.40

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Solution

The fourth proportional to 378,010.80, 521,672.40 and 257,288.40 is: 355,069.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,010.80 : 521,672.40 = 257,288.40 : x
  2. Step 2: Convert to fraction form
    378,010.80/521,672.40 = 257,288.40/x
  3. Step 3: Cross multiply
    378,010.80x = 521,672.40 × 257,288.40
  4. Step 4: Simplify right side
    378,010.80x = 134,220,257,120.16
  5. Step 5: Solve for x
    x = 134,220,257,120.16/378,010.80
  6. Step 6: Final answer
    x = 355,069.90

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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.