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Finding the Fourth Proportional to 644.12, 888.76 and 411.16

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Solution

The fourth proportional to 644.12, 888.76 and 411.16 is: 567.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.12 : 888.76 = 411.16 : x
  2. Step 2: Convert to fraction form
    644.12/888.76 = 411.16/x
  3. Step 3: Cross multiply
    644.12x = 888.76 × 411.16
  4. Step 4: Simplify right side
    644.12x = 365,422.56
  5. Step 5: Solve for x
    x = 365,422.56/644.12
  6. Step 6: Final answer
    x = 567.32

Related Problems

Find fourth proportional to 322.06, 444.38 and 205.58
Half scale
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Double scale
Find fourth proportional to 645.12, 890.14 and 412.16
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.