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Finding the Fourth Proportional to 3,156.79, 4,360.79 and 2,990.71

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Solution

The fourth proportional to 3,156.79, 4,360.79 and 2,990.71 is: 4,131.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,156.79 : 4,360.79 = 2,990.71 : x
  2. Step 2: Convert to fraction form
    3,156.79/4,360.79 = 2,990.71/x
  3. Step 3: Cross multiply
    3,156.79x = 4,360.79 × 2,990.71
  4. Step 4: Simplify right side
    3,156.79x = 13,041,858.26
  5. Step 5: Solve for x
    x = 13,041,858.26/3,156.79
  6. Step 6: Final answer
    x = 4,131.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.