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Finding the Fourth Proportional to 421.74, 581.79 and 283.50

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Solution

The fourth proportional to 421.74, 581.79 and 283.50 is: 391.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.74 : 581.79 = 283.50 : x
  2. Step 2: Convert to fraction form
    421.74/581.79 = 283.50/x
  3. Step 3: Cross multiply
    421.74x = 581.79 × 283.50
  4. Step 4: Simplify right side
    421.74x = 164,937.47
  5. Step 5: Solve for x
    x = 164,937.47/421.74
  6. Step 6: Final answer
    x = 391.09

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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.