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Finding the Fourth Proportional to 520.84, 718.77 and 311.20

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Solution

The fourth proportional to 520.84, 718.77 and 311.20 is: 429.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.84 : 718.77 = 311.20 : x
  2. Step 2: Convert to fraction form
    520.84/718.77 = 311.20/x
  3. Step 3: Cross multiply
    520.84x = 718.77 × 311.20
  4. Step 4: Simplify right side
    520.84x = 223,681.22
  5. Step 5: Solve for x
    x = 223,681.22/520.84
  6. Step 6: Final answer
    x = 429.46

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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.