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Finding the Fourth Proportional to 644.91, 890.14 and 382.88

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Solution

The fourth proportional to 644.91, 890.14 and 382.88 is: 528.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.91 : 890.14 = 382.88 : x
  2. Step 2: Convert to fraction form
    644.91/890.14 = 382.88/x
  3. Step 3: Cross multiply
    644.91x = 890.14 × 382.88
  4. Step 4: Simplify right side
    644.91x = 340,811.40
  5. Step 5: Solve for x
    x = 340,811.40/644.91
  6. Step 6: Final answer
    x = 528.46

Related Problems

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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.