Home / 1,878.18-2,813.40-1,291.20

Finding the Fourth Proportional to 1,878.18, 2,813.40 and 1,291.20

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Solution

The fourth proportional to 1,878.18, 2,813.40 and 1,291.20 is: 1,934.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.18 : 2,813.40 = 1,291.20 : x
  2. Step 2: Convert to fraction form
    1,878.18/2,813.40 = 1,291.20/x
  3. Step 3: Cross multiply
    1,878.18x = 2,813.40 × 1,291.20
  4. Step 4: Simplify right side
    1,878.18x = 3,632,662.08
  5. Step 5: Solve for x
    x = 3,632,662.08/1,878.18
  6. Step 6: Final answer
    x = 1,934.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.