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Finding the Fourth Proportional to 320.77, 442.80 and 210.43

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Solution

The fourth proportional to 320.77, 442.80 and 210.43 is: 290.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.77 : 442.80 = 210.43 : x
  2. Step 2: Convert to fraction form
    320.77/442.80 = 210.43/x
  3. Step 3: Cross multiply
    320.77x = 442.80 × 210.43
  4. Step 4: Simplify right side
    320.77x = 93,176.19
  5. Step 5: Solve for x
    x = 93,176.19/320.77
  6. Step 6: Final answer
    x = 290.48

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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.