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Finding the Fourth Proportional to 643.34, 888.24 and 422.67

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Solution

The fourth proportional to 643.34, 888.24 and 422.67 is: 583.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.34 : 888.24 = 422.67 : x
  2. Step 2: Convert to fraction form
    643.34/888.24 = 422.67/x
  3. Step 3: Cross multiply
    643.34x = 888.24 × 422.67
  4. Step 4: Simplify right side
    643.34x = 375,432.40
  5. Step 5: Solve for x
    x = 375,432.40/643.34
  6. Step 6: Final answer
    x = 583.57

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1.5x scale

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.