Home / 2,128.31-2,937.13-1,289.17

Finding the Fourth Proportional to 2,128.31, 2,937.13 and 1,289.17

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Solution

The fourth proportional to 2,128.31, 2,937.13 and 1,289.17 is: 1,779.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.31 : 2,937.13 = 1,289.17 : x
  2. Step 2: Convert to fraction form
    2,128.31/2,937.13 = 1,289.17/x
  3. Step 3: Cross multiply
    2,128.31x = 2,937.13 × 1,289.17
  4. Step 4: Simplify right side
    2,128.31x = 3,786,445.20
  5. Step 5: Solve for x
    x = 3,786,445.20/2,128.31
  6. Step 6: Final answer
    x = 1,779.09

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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.