Home / 2,109.79-2,911.26-1,225.45

Finding the Fourth Proportional to 2,109.79, 2,911.26 and 1,225.45

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Solution

The fourth proportional to 2,109.79, 2,911.26 and 1,225.45 is: 1,690.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109.79 : 2,911.26 = 1,225.45 : x
  2. Step 2: Convert to fraction form
    2,109.79/2,911.26 = 1,225.45/x
  3. Step 3: Cross multiply
    2,109.79x = 2,911.26 × 1,225.45
  4. Step 4: Simplify right side
    2,109.79x = 3,567,603.57
  5. Step 5: Solve for x
    x = 3,567,603.57/2,109.79
  6. Step 6: Final answer
    x = 1,690.98

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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.