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Finding the Fourth Proportional to 3,220.60, 4,830.90 and 912.12

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Solution

The fourth proportional to 3,220.60, 4,830.90 and 912.12 is: 1,368.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,220.60 : 4,830.90 = 912.12 : x
  2. Step 2: Convert to fraction form
    3,220.60/4,830.90 = 912.12/x
  3. Step 3: Cross multiply
    3,220.60x = 4,830.90 × 912.12
  4. Step 4: Simplify right side
    3,220.60x = 4,406,360.51
  5. Step 5: Solve for x
    x = 4,406,360.51/3,220.60
  6. Step 6: Final answer
    x = 1,368.18

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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.