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Finding the Fourth Proportional to 320.98, 442.65 and 210.55

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Solution

The fourth proportional to 320.98, 442.65 and 210.55 is: 290.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.98 : 442.65 = 210.55 : x
  2. Step 2: Convert to fraction form
    320.98/442.65 = 210.55/x
  3. Step 3: Cross multiply
    320.98x = 442.65 × 210.55
  4. Step 4: Simplify right side
    320.98x = 93,199.96
  5. Step 5: Solve for x
    x = 93,199.96/320.98
  6. Step 6: Final answer
    x = 290.36

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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.