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Finding the Fourth Proportional to 1,391.04, 1,918.08 and 1,218.24

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Solution

The fourth proportional to 1,391.04, 1,918.08 and 1,218.24 is: 1,679.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.04 : 1,918.08 = 1,218.24 : x
  2. Step 2: Convert to fraction form
    1,391.04/1,918.08 = 1,218.24/x
  3. Step 3: Cross multiply
    1,391.04x = 1,918.08 × 1,218.24
  4. Step 4: Simplify right side
    1,391.04x = 2,336,681.78
  5. Step 5: Solve for x
    x = 2,336,681.78/1,391.04
  6. Step 6: Final answer
    x = 1,679.81

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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.