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Finding the Fourth Proportional to 522.80, 784.20 and 425.60

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Solution

The fourth proportional to 522.80, 784.20 and 425.60 is: 638.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.80 : 784.20 = 425.60 : x
  2. Step 2: Convert to fraction form
    522.80/784.20 = 425.60/x
  3. Step 3: Cross multiply
    522.80x = 784.20 × 425.60
  4. Step 4: Simplify right side
    522.80x = 333,755.52
  5. Step 5: Solve for x
    x = 333,755.52/522.80
  6. Step 6: Final answer
    x = 638.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.