Home / 28,361.64-39,139.05-15,789.36

Finding the Fourth Proportional to 28,361.64, 39,139.05 and 15,789.36

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Solution

The fourth proportional to 28,361.64, 39,139.05 and 15,789.36 is: 21,789.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,361.64 : 39,139.05 = 15,789.36 : x
  2. Step 2: Convert to fraction form
    28,361.64/39,139.05 = 15,789.36/x
  3. Step 3: Cross multiply
    28,361.64x = 39,139.05 × 15,789.36
  4. Step 4: Simplify right side
    28,361.64x = 617,980,550.51
  5. Step 5: Solve for x
    x = 617,980,550.51/28,361.64
  6. Step 6: Final answer
    x = 21,789.31

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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.