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Finding the Fourth Proportional to 1,840.40, 2,758.20 and 853.10

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Solution

The fourth proportional to 1,840.40, 2,758.20 and 853.10 is: 1,278.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,840.40 : 2,758.20 = 853.10 : x
  2. Step 2: Convert to fraction form
    1,840.40/2,758.20 = 853.10/x
  3. Step 3: Cross multiply
    1,840.40x = 2,758.20 × 853.10
  4. Step 4: Simplify right side
    1,840.40x = 2,353,020.42
  5. Step 5: Solve for x
    x = 2,353,020.42/1,840.40
  6. Step 6: Final answer
    x = 1,278.54

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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.