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Finding the Fourth Proportional to 422.79, 583.40 and 283.16

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Solution

The fourth proportional to 422.79, 583.40 and 283.16 is: 390.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.79 : 583.40 = 283.16 : x
  2. Step 2: Convert to fraction form
    422.79/583.40 = 283.16/x
  3. Step 3: Cross multiply
    422.79x = 583.40 × 283.16
  4. Step 4: Simplify right side
    422.79x = 165,191.21
  5. Step 5: Solve for x
    x = 165,191.21/422.79
  6. Step 6: Final answer
    x = 390.72

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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.