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Finding the Fourth Proportional to 1,378.48, 1,900.05 and 936.22

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Solution

The fourth proportional to 1,378.48, 1,900.05 and 936.22 is: 1,290.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.48 : 1,900.05 = 936.22 : x
  2. Step 2: Convert to fraction form
    1,378.48/1,900.05 = 936.22/x
  3. Step 3: Cross multiply
    1,378.48x = 1,900.05 × 936.22
  4. Step 4: Simplify right side
    1,378.48x = 1,778,855.31
  5. Step 5: Solve for x
    x = 1,778,855.31/1,378.48
  6. Step 6: Final answer
    x = 1,290.45

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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.