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Finding the Fourth Proportional to 520.74, 718.38 and 310.86

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Solution

The fourth proportional to 520.74, 718.38 and 310.86 is: 428.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.74 : 718.38 = 310.86 : x
  2. Step 2: Convert to fraction form
    520.74/718.38 = 310.86/x
  3. Step 3: Cross multiply
    520.74x = 718.38 × 310.86
  4. Step 4: Simplify right side
    520.74x = 223,315.61
  5. Step 5: Solve for x
    x = 223,315.61/520.74
  6. Step 6: Final answer
    x = 428.84

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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.