Home / 378,428.28-521,688.36-297,715.64

Finding the Fourth Proportional to 378,428.28, 521,688.36 and 297,715.64

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Solution

The fourth proportional to 378,428.28, 521,688.36 and 297,715.64 is: 410,420.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,428.28 : 521,688.36 = 297,715.64 : x
  2. Step 2: Convert to fraction form
    378,428.28/521,688.36 = 297,715.64/x
  3. Step 3: Cross multiply
    378,428.28x = 521,688.36 × 297,715.64
  4. Step 4: Simplify right side
    378,428.28x = 155,314,783,977.95
  5. Step 5: Solve for x
    x = 155,314,783,977.95/378,428.28
  6. Step 6: Final answer
    x = 410,420.66

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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.