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Finding the Fourth Proportional to 5,642.70, 7,786.74 and 3,124.70

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Solution

The fourth proportional to 5,642.70, 7,786.74 and 3,124.70 is: 4,311.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,642.70 : 7,786.74 = 3,124.70 : x
  2. Step 2: Convert to fraction form
    5,642.70/7,786.74 = 3,124.70/x
  3. Step 3: Cross multiply
    5,642.70x = 7,786.74 × 3,124.70
  4. Step 4: Simplify right side
    5,642.70x = 24,331,226.48
  5. Step 5: Solve for x
    x = 24,331,226.48/5,642.70
  6. Step 6: Final answer
    x = 4,311.98

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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.