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Finding the Fourth Proportional to 1,907.76, 2,861.68 and 812.32

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Solution

The fourth proportional to 1,907.76, 2,861.68 and 812.32 is: 1,218.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,907.76 : 2,861.68 = 812.32 : x
  2. Step 2: Convert to fraction form
    1,907.76/2,861.68 = 812.32/x
  3. Step 3: Cross multiply
    1,907.76x = 2,861.68 × 812.32
  4. Step 4: Simplify right side
    1,907.76x = 2,324,599.90
  5. Step 5: Solve for x
    x = 2,324,599.90/1,907.76
  6. Step 6: Final answer
    x = 1,218.50

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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.