Home / 28,359.84-39,138.48-15,784.64

Finding the Fourth Proportional to 28,359.84, 39,138.48 and 15,784.64

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Solution

The fourth proportional to 28,359.84, 39,138.48 and 15,784.64 is: 21,783.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,359.84 : 39,138.48 = 15,784.64 : x
  2. Step 2: Convert to fraction form
    28,359.84/39,138.48 = 15,784.64/x
  3. Step 3: Cross multiply
    28,359.84x = 39,138.48 × 15,784.64
  4. Step 4: Simplify right side
    28,359.84x = 617,786,816.95
  5. Step 5: Solve for x
    x = 617,786,816.95/28,359.84
  6. Step 6: Final answer
    x = 21,783.86

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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.