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Finding the Fourth Proportional to 520.94, 719.10 and 321.80

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Solution

The fourth proportional to 520.94, 719.10 and 321.80 is: 444.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.94 : 719.10 = 321.80 : x
  2. Step 2: Convert to fraction form
    520.94/719.10 = 321.80/x
  3. Step 3: Cross multiply
    520.94x = 719.10 × 321.80
  4. Step 4: Simplify right side
    520.94x = 231,406.38
  5. Step 5: Solve for x
    x = 231,406.38/520.94
  6. Step 6: Final answer
    x = 444.21

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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.