Home / 3,120.84-4,307.32-1,861.98

Finding the Fourth Proportional to 3,120.84, 4,307.32 and 1,861.98

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Solution

The fourth proportional to 3,120.84, 4,307.32 and 1,861.98 is: 2,569.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.84 : 4,307.32 = 1,861.98 : x
  2. Step 2: Convert to fraction form
    3,120.84/4,307.32 = 1,861.98/x
  3. Step 3: Cross multiply
    3,120.84x = 4,307.32 × 1,861.98
  4. Step 4: Simplify right side
    3,120.84x = 8,020,143.69
  5. Step 5: Solve for x
    x = 8,020,143.69/3,120.84
  6. Step 6: Final answer
    x = 2,569.87

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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.