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Finding the Fourth Proportional to 320.22, 442.26 and 312.12

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Solution

The fourth proportional to 320.22, 442.26 and 312.12 is: 431.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.22 : 442.26 = 312.12 : x
  2. Step 2: Convert to fraction form
    320.22/442.26 = 312.12/x
  3. Step 3: Cross multiply
    320.22x = 442.26 × 312.12
  4. Step 4: Simplify right side
    320.22x = 138,038.19
  5. Step 5: Solve for x
    x = 138,038.19/320.22
  6. Step 6: Final answer
    x = 431.07

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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.