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Finding the Fourth Proportional to 421.24, 581.10 and 283

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Solution

The fourth proportional to 421.24, 581.10 and 283 is: 390.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.24 : 581.10 = 283 : x
  2. Step 2: Convert to fraction form
    421.24/581.10 = 283/x
  3. Step 3: Cross multiply
    421.24x = 581.10 × 283
  4. Step 4: Simplify right side
    421.24x = 164,451.30
  5. Step 5: Solve for x
    x = 164,451.30/421.24
  6. Step 6: Final answer
    x = 390.40

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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.