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Finding the Fourth Proportional to 573.12, 790.90 and 311.12

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Solution

The fourth proportional to 573.12, 790.90 and 311.12 is: 429.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    573.12 : 790.90 = 311.12 : x
  2. Step 2: Convert to fraction form
    573.12/790.90 = 311.12/x
  3. Step 3: Cross multiply
    573.12x = 790.90 × 311.12
  4. Step 4: Simplify right side
    573.12x = 246,064.81
  5. Step 5: Solve for x
    x = 246,064.81/573.12
  6. Step 6: Final answer
    x = 429.34

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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.