Home / 2,128.50-2,937.90-1,289.07

Finding the Fourth Proportional to 2,128.50, 2,937.90 and 1,289.07

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Solution

The fourth proportional to 2,128.50, 2,937.90 and 1,289.07 is: 1,779.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.50 : 2,937.90 = 1,289.07 : x
  2. Step 2: Convert to fraction form
    2,128.50/2,937.90 = 1,289.07/x
  3. Step 3: Cross multiply
    2,128.50x = 2,937.90 × 1,289.07
  4. Step 4: Simplify right side
    2,128.50x = 3,787,158.75
  5. Step 5: Solve for x
    x = 3,787,158.75/2,128.50
  6. Step 6: Final answer
    x = 1,779.26

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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.