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Finding the Fourth Proportional to 657.75, 986.68 and 218.99

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Solution

The fourth proportional to 657.75, 986.68 and 218.99 is: 328.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.75 : 986.68 = 218.99 : x
  2. Step 2: Convert to fraction form
    657.75/986.68 = 218.99/x
  3. Step 3: Cross multiply
    657.75x = 986.68 × 218.99
  4. Step 4: Simplify right side
    657.75x = 216,067.02
  5. Step 5: Solve for x
    x = 216,067.02/657.75
  6. Step 6: Final answer
    x = 328.49

Related Problems

Find fourth proportional to 328.88, 493.34 and 109.49
Half scale
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Double scale
Find fourth proportional to 658.75, 988.18 and 219.99
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.