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Finding the Fourth Proportional to 1,238.80, 1,856.40 and 853.60

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Solution

The fourth proportional to 1,238.80, 1,856.40 and 853.60 is: 1,279.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.80 : 1,856.40 = 853.60 : x
  2. Step 2: Convert to fraction form
    1,238.80/1,856.40 = 853.60/x
  3. Step 3: Cross multiply
    1,238.80x = 1,856.40 × 853.60
  4. Step 4: Simplify right side
    1,238.80x = 1,584,623.04
  5. Step 5: Solve for x
    x = 1,584,623.04/1,238.80
  6. Step 6: Final answer
    x = 1,279.16

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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.