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Finding the Fourth Proportional to 1,019.40, 1,406.97 and 853.56

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Solution

The fourth proportional to 1,019.40, 1,406.97 and 853.56 is: 1,178.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.40 : 1,406.97 = 853.56 : x
  2. Step 2: Convert to fraction form
    1,019.40/1,406.97 = 853.56/x
  3. Step 3: Cross multiply
    1,019.40x = 1,406.97 × 853.56
  4. Step 4: Simplify right side
    1,019.40x = 1,200,928.37
  5. Step 5: Solve for x
    x = 1,200,928.37/1,019.40
  6. Step 6: Final answer
    x = 1,178.07

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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.