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Finding the Fourth Proportional to 520.79, 718.34 and 485.62

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Solution

The fourth proportional to 520.79, 718.34 and 485.62 is: 669.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.79 : 718.34 = 485.62 : x
  2. Step 2: Convert to fraction form
    520.79/718.34 = 485.62/x
  3. Step 3: Cross multiply
    520.79x = 718.34 × 485.62
  4. Step 4: Simplify right side
    520.79x = 348,836.05
  5. Step 5: Solve for x
    x = 348,836.05/520.79
  6. Step 6: Final answer
    x = 669.83

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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.