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Finding the Fourth Proportional to 830.46, 1,245.68 and 214.16

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Solution

The fourth proportional to 830.46, 1,245.68 and 214.16 is: 321.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.46 : 1,245.68 = 214.16 : x
  2. Step 2: Convert to fraction form
    830.46/1,245.68 = 214.16/x
  3. Step 3: Cross multiply
    830.46x = 1,245.68 × 214.16
  4. Step 4: Simplify right side
    830.46x = 266,767.53
  5. Step 5: Solve for x
    x = 266,767.53/830.46
  6. Step 6: Final answer
    x = 321.23

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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.