Home / 1,861.20-2,792.70-1,312.20

Finding the Fourth Proportional to 1,861.20, 2,792.70 and 1,312.20

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Solution

The fourth proportional to 1,861.20, 2,792.70 and 1,312.20 is: 1,968.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.20 : 2,792.70 = 1,312.20 : x
  2. Step 2: Convert to fraction form
    1,861.20/2,792.70 = 1,312.20/x
  3. Step 3: Cross multiply
    1,861.20x = 2,792.70 × 1,312.20
  4. Step 4: Simplify right side
    1,861.20x = 3,664,580.94
  5. Step 5: Solve for x
    x = 3,664,580.94/1,861.20
  6. Step 6: Final answer
    x = 1,968.93

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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.