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Finding the Fourth Proportional to 2,861.16, 4,292.04 and 912.90

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Solution

The fourth proportional to 2,861.16, 4,292.04 and 912.90 is: 1,369.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,861.16 : 4,292.04 = 912.90 : x
  2. Step 2: Convert to fraction form
    2,861.16/4,292.04 = 912.90/x
  3. Step 3: Cross multiply
    2,861.16x = 4,292.04 × 912.90
  4. Step 4: Simplify right side
    2,861.16x = 3,918,203.32
  5. Step 5: Solve for x
    x = 3,918,203.32/2,861.16
  6. Step 6: Final answer
    x = 1,369.45

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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.