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Finding the Fourth Proportional to 354.64, 489.38 and 199.40

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Solution

The fourth proportional to 354.64, 489.38 and 199.40 is: 275.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.64 : 489.38 = 199.40 : x
  2. Step 2: Convert to fraction form
    354.64/489.38 = 199.40/x
  3. Step 3: Cross multiply
    354.64x = 489.38 × 199.40
  4. Step 4: Simplify right side
    354.64x = 97,582.37
  5. Step 5: Solve for x
    x = 97,582.37/354.64
  6. Step 6: Final answer
    x = 275.16

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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.