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Finding the Fourth Proportional to 559.31, 839.29 and 312.72

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Solution

The fourth proportional to 559.31, 839.29 and 312.72 is: 469.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    559.31 : 839.29 = 312.72 : x
  2. Step 2: Convert to fraction form
    559.31/839.29 = 312.72/x
  3. Step 3: Cross multiply
    559.31x = 839.29 × 312.72
  4. Step 4: Simplify right side
    559.31x = 262,462.77
  5. Step 5: Solve for x
    x = 262,462.77/559.31
  6. Step 6: Final answer
    x = 469.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.