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Finding the Fourth Proportional to 19, 28.50 and 10.99

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Solution

The fourth proportional to 19, 28.50 and 10.99 is: 16.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    19 : 28.50 = 10.99 : x
  2. Step 2: Convert to fraction form
    19/28.50 = 10.99/x
  3. Step 3: Cross multiply
    19x = 28.50 × 10.99
  4. Step 4: Simplify right side
    19x = 313.22
  5. Step 5: Solve for x
    x = 313.22/19
  6. Step 6: Final answer
    x = 16.49

Related Problems

Find fourth proportional to 9.50, 14.25 and 5.50
Half scale
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Double scale
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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.