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Finding the Fourth Proportional to 912.12, 1,368.18 and 228.12

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Solution

The fourth proportional to 912.12, 1,368.18 and 228.12 is: 342.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.12 : 1,368.18 = 228.12 : x
  2. Step 2: Convert to fraction form
    912.12/1,368.18 = 228.12/x
  3. Step 3: Cross multiply
    912.12x = 1,368.18 × 228.12
  4. Step 4: Simplify right side
    912.12x = 312,109.22
  5. Step 5: Solve for x
    x = 312,109.22/912.12
  6. Step 6: Final answer
    x = 342.18

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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.