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Finding the Fourth Proportional to 521.73, 719.94 and 311.89

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Solution

The fourth proportional to 521.73, 719.94 and 311.89 is: 430.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.73 : 719.94 = 311.89 : x
  2. Step 2: Convert to fraction form
    521.73/719.94 = 311.89/x
  3. Step 3: Cross multiply
    521.73x = 719.94 × 311.89
  4. Step 4: Simplify right side
    521.73x = 224,542.09
  5. Step 5: Solve for x
    x = 224,542.09/521.73
  6. Step 6: Final answer
    x = 430.38

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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.