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Finding the Fourth Proportional to 644.99, 890.10 and 379.45

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Solution

The fourth proportional to 644.99, 890.10 and 379.45 is: 523.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.99 : 890.10 = 379.45 : x
  2. Step 2: Convert to fraction form
    644.99/890.10 = 379.45/x
  3. Step 3: Cross multiply
    644.99x = 890.10 × 379.45
  4. Step 4: Simplify right side
    644.99x = 337,746.34
  5. Step 5: Solve for x
    x = 337,746.34/644.99
  6. Step 6: Final answer
    x = 523.65

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Double scale
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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.