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Finding the Fourth Proportional to 423.72, 584.28 and 307.20

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Solution

The fourth proportional to 423.72, 584.28 and 307.20 is: 423.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.72 : 584.28 = 307.20 : x
  2. Step 2: Convert to fraction form
    423.72/584.28 = 307.20/x
  3. Step 3: Cross multiply
    423.72x = 584.28 × 307.20
  4. Step 4: Simplify right side
    423.72x = 179,490.82
  5. Step 5: Solve for x
    x = 179,490.82/423.72
  6. Step 6: Final answer
    x = 423.61

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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.