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Finding the Fourth Proportional to 520.70, 718.60 and 310.91

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Solution

The fourth proportional to 520.70, 718.60 and 310.91 is: 429.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.70 : 718.60 = 310.91 : x
  2. Step 2: Convert to fraction form
    520.70/718.60 = 310.91/x
  3. Step 3: Cross multiply
    520.70x = 718.60 × 310.91
  4. Step 4: Simplify right side
    520.70x = 223,421.33
  5. Step 5: Solve for x
    x = 223,421.33/520.70
  6. Step 6: Final answer
    x = 429.08

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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.