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Finding the Fourth Proportional to 644.28, 890.24 and 504.76

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Solution

The fourth proportional to 644.28, 890.24 and 504.76 is: 697.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.28 : 890.24 = 504.76 : x
  2. Step 2: Convert to fraction form
    644.28/890.24 = 504.76/x
  3. Step 3: Cross multiply
    644.28x = 890.24 × 504.76
  4. Step 4: Simplify right side
    644.28x = 449,357.54
  5. Step 5: Solve for x
    x = 449,357.54/644.28
  6. Step 6: Final answer
    x = 697.46

Related Problems

Find fourth proportional to 322.14, 445.12 and 252.38
Half scale
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Double scale
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Similar ratio
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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.