Home / 1,290.09-1,781.63-974.84

Finding the Fourth Proportional to 1,290.09, 1,781.63 and 974.84

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Solution

The fourth proportional to 1,290.09, 1,781.63 and 974.84 is: 1,346.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.09 : 1,781.63 = 974.84 : x
  2. Step 2: Convert to fraction form
    1,290.09/1,781.63 = 974.84/x
  3. Step 3: Cross multiply
    1,290.09x = 1,781.63 × 974.84
  4. Step 4: Simplify right side
    1,290.09x = 1,736,790.41
  5. Step 5: Solve for x
    x = 1,736,790.41/1,290.09
  6. Step 6: Final answer
    x = 1,346.26

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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.