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Finding the Fourth Proportional to 639.55, 959.19 and 223.03

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Solution

The fourth proportional to 639.55, 959.19 and 223.03 is: 334.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.55 : 959.19 = 223.03 : x
  2. Step 2: Convert to fraction form
    639.55/959.19 = 223.03/x
  3. Step 3: Cross multiply
    639.55x = 959.19 × 223.03
  4. Step 4: Simplify right side
    639.55x = 213,928.15
  5. Step 5: Solve for x
    x = 213,928.15/639.55
  6. Step 6: Final answer
    x = 334.50

Related Problems

Find fourth proportional to 319.78, 479.60 and 111.52
Half scale
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Double scale
Find fourth proportional to 640.55, 960.69 and 224.03
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.