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Finding the Fourth Proportional to 644.76, 890.20 and 396.32

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Solution

The fourth proportional to 644.76, 890.20 and 396.32 is: 547.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.76 : 890.20 = 396.32 : x
  2. Step 2: Convert to fraction form
    644.76/890.20 = 396.32/x
  3. Step 3: Cross multiply
    644.76x = 890.20 × 396.32
  4. Step 4: Simplify right side
    644.76x = 352,804.06
  5. Step 5: Solve for x
    x = 352,804.06/644.76
  6. Step 6: Final answer
    x = 547.19

Related Problems

Find fourth proportional to 322.38, 445.10 and 198.16
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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.