Home / 1,290.30-1,782.63-1,186.62

Finding the Fourth Proportional to 1,290.30, 1,782.63 and 1,186.62

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Solution

The fourth proportional to 1,290.30, 1,782.63 and 1,186.62 is: 1,639.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.30 : 1,782.63 = 1,186.62 : x
  2. Step 2: Convert to fraction form
    1,290.30/1,782.63 = 1,186.62/x
  3. Step 3: Cross multiply
    1,290.30x = 1,782.63 × 1,186.62
  4. Step 4: Simplify right side
    1,290.30x = 2,115,304.41
  5. Step 5: Solve for x
    x = 2,115,304.41/1,290.30
  6. Step 6: Final answer
    x = 1,639.39

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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.