Home / 1,990.42-2,746.11-1,291.93

Finding the Fourth Proportional to 1,990.42, 2,746.11 and 1,291.93

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Solution

The fourth proportional to 1,990.42, 2,746.11 and 1,291.93 is: 1,782.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.42 : 2,746.11 = 1,291.93 : x
  2. Step 2: Convert to fraction form
    1,990.42/2,746.11 = 1,291.93/x
  3. Step 3: Cross multiply
    1,990.42x = 2,746.11 × 1,291.93
  4. Step 4: Simplify right side
    1,990.42x = 3,547,781.89
  5. Step 5: Solve for x
    x = 3,547,781.89/1,990.42
  6. Step 6: Final answer
    x = 1,782.43

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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.