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Finding the Fourth Proportional to 1,485.63, 2,229.39 and 870.57

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Solution

The fourth proportional to 1,485.63, 2,229.39 and 870.57 is: 1,306.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.63 : 2,229.39 = 870.57 : x
  2. Step 2: Convert to fraction form
    1,485.63/2,229.39 = 870.57/x
  3. Step 3: Cross multiply
    1,485.63x = 2,229.39 × 870.57
  4. Step 4: Simplify right side
    1,485.63x = 1,940,840.05
  5. Step 5: Solve for x
    x = 1,940,840.05/1,485.63
  6. Step 6: Final answer
    x = 1,306.41

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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.