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Finding the Fourth Proportional to 1,485.41, 2,227.85 and 389.71

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Solution

The fourth proportional to 1,485.41, 2,227.85 and 389.71 is: 584.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.41 : 2,227.85 = 389.71 : x
  2. Step 2: Convert to fraction form
    1,485.41/2,227.85 = 389.71/x
  3. Step 3: Cross multiply
    1,485.41x = 2,227.85 × 389.71
  4. Step 4: Simplify right side
    1,485.41x = 868,219.91
  5. Step 5: Solve for x
    x = 868,219.91/1,485.41
  6. Step 6: Final answer
    x = 584.50

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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.