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Finding the Fourth Proportional to 421.48, 580.74 and 283.24

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Solution

The fourth proportional to 421.48, 580.74 and 283.24 is: 390.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.48 : 580.74 = 283.24 : x
  2. Step 2: Convert to fraction form
    421.48/580.74 = 283.24/x
  3. Step 3: Cross multiply
    421.48x = 580.74 × 283.24
  4. Step 4: Simplify right side
    421.48x = 164,488.80
  5. Step 5: Solve for x
    x = 164,488.80/421.48
  6. Step 6: Final answer
    x = 390.26

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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.