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Finding the Fourth Proportional to 421.64, 581.76 and 274.28

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Solution

The fourth proportional to 421.64, 581.76 and 274.28 is: 378.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.64 : 581.76 = 274.28 : x
  2. Step 2: Convert to fraction form
    421.64/581.76 = 274.28/x
  3. Step 3: Cross multiply
    421.64x = 581.76 × 274.28
  4. Step 4: Simplify right side
    421.64x = 159,565.13
  5. Step 5: Solve for x
    x = 159,565.13/421.64
  6. Step 6: Final answer
    x = 378.44

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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.