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Finding the Fourth Proportional to 378,429.28, 521,689.74 and 297,716.64

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Solution

The fourth proportional to 378,429.28, 521,689.74 and 297,716.64 is: 410,422.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,429.28 : 521,689.74 = 297,716.64 : x
  2. Step 2: Convert to fraction form
    378,429.28/521,689.74 = 297,716.64/x
  3. Step 3: Cross multiply
    378,429.28x = 521,689.74 × 297,716.64
  4. Step 4: Simplify right side
    378,429.28x = 155,315,716,515.27
  5. Step 5: Solve for x
    x = 155,315,716,515.27/378,429.28
  6. Step 6: Final answer
    x = 410,422.04

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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.