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Finding the Fourth Proportional to 641.70, 962.72 and 208.98

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Solution

The fourth proportional to 641.70, 962.72 and 208.98 is: 313.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.70 : 962.72 = 208.98 : x
  2. Step 2: Convert to fraction form
    641.70/962.72 = 208.98/x
  3. Step 3: Cross multiply
    641.70x = 962.72 × 208.98
  4. Step 4: Simplify right side
    641.70x = 201,189.23
  5. Step 5: Solve for x
    x = 201,189.23/641.70
  6. Step 6: Final answer
    x = 313.53

Related Problems

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Double scale
Find fourth proportional to 642.70, 964.22 and 209.98
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.