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Finding the Fourth Proportional to 644.76, 890.02 and 396.28

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Solution

The fourth proportional to 644.76, 890.02 and 396.28 is: 547.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.76 : 890.02 = 396.28 : x
  2. Step 2: Convert to fraction form
    644.76/890.02 = 396.28/x
  3. Step 3: Cross multiply
    644.76x = 890.02 × 396.28
  4. Step 4: Simplify right side
    644.76x = 352,697.13
  5. Step 5: Solve for x
    x = 352,697.13/644.76
  6. Step 6: Final answer
    x = 547.02

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Find fourth proportional to 322.38, 445.01 and 198.14
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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.