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Finding the Fourth Proportional to 305.58, 423.68 and 289.20

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Solution

The fourth proportional to 305.58, 423.68 and 289.20 is: 400.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.58 : 423.68 = 289.20 : x
  2. Step 2: Convert to fraction form
    305.58/423.68 = 289.20/x
  3. Step 3: Cross multiply
    305.58x = 423.68 × 289.20
  4. Step 4: Simplify right side
    305.58x = 122,528.26
  5. Step 5: Solve for x
    x = 122,528.26/305.58
  6. Step 6: Final answer
    x = 400.97

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.