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Finding the Fourth Proportional to 1,279.08, 1,918.40 and 401.49

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Solution

The fourth proportional to 1,279.08, 1,918.40 and 401.49 is: 602.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.08 : 1,918.40 = 401.49 : x
  2. Step 2: Convert to fraction form
    1,279.08/1,918.40 = 401.49/x
  3. Step 3: Cross multiply
    1,279.08x = 1,918.40 × 401.49
  4. Step 4: Simplify right side
    1,279.08x = 770,216.41
  5. Step 5: Solve for x
    x = 770,216.41/1,279.08
  6. Step 6: Final answer
    x = 602.16

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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.