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Finding the Fourth Proportional to 520.92, 720.72 and 455.49

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Solution

The fourth proportional to 520.92, 720.72 and 455.49 is: 630.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.92 : 720.72 = 455.49 : x
  2. Step 2: Convert to fraction form
    520.92/720.72 = 455.49/x
  3. Step 3: Cross multiply
    520.92x = 720.72 × 455.49
  4. Step 4: Simplify right side
    520.92x = 328,280.75
  5. Step 5: Solve for x
    x = 328,280.75/520.92
  6. Step 6: Final answer
    x = 630.19

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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.