Home / 1,948.35-2,690.91-1,288.20

Finding the Fourth Proportional to 1,948.35, 2,690.91 and 1,288.20

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Solution

The fourth proportional to 1,948.35, 2,690.91 and 1,288.20 is: 1,779.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,948.35 : 2,690.91 = 1,288.20 : x
  2. Step 2: Convert to fraction form
    1,948.35/2,690.91 = 1,288.20/x
  3. Step 3: Cross multiply
    1,948.35x = 2,690.91 × 1,288.20
  4. Step 4: Simplify right side
    1,948.35x = 3,466,430.26
  5. Step 5: Solve for x
    x = 3,466,430.26/1,948.35
  6. Step 6: Final answer
    x = 1,779.16

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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.