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Finding the Fourth Proportional to 320.55, 442.08 and 258.36

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Solution

The fourth proportional to 320.55, 442.08 and 258.36 is: 356.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.55 : 442.08 = 258.36 : x
  2. Step 2: Convert to fraction form
    320.55/442.08 = 258.36/x
  3. Step 3: Cross multiply
    320.55x = 442.08 × 258.36
  4. Step 4: Simplify right side
    320.55x = 114,215.79
  5. Step 5: Solve for x
    x = 114,215.79/320.55
  6. Step 6: Final answer
    x = 356.31

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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.