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Finding the Fourth Proportional to 2,861.79, 4,292.84 and 913.84

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Solution

The fourth proportional to 2,861.79, 4,292.84 and 913.84 is: 1,370.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,861.79 : 4,292.84 = 913.84 : x
  2. Step 2: Convert to fraction form
    2,861.79/4,292.84 = 913.84/x
  3. Step 3: Cross multiply
    2,861.79x = 4,292.84 × 913.84
  4. Step 4: Simplify right side
    2,861.79x = 3,922,968.91
  5. Step 5: Solve for x
    x = 3,922,968.91/2,861.79
  6. Step 6: Final answer
    x = 1,370.81

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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.