Home / 20,470.78-30,720.75-8,787.34

Finding the Fourth Proportional to 20,470.78, 30,720.75 and 8,787.34

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Solution

The fourth proportional to 20,470.78, 30,720.75 and 8,787.34 is: 13,187.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,470.78 : 30,720.75 = 8,787.34 : x
  2. Step 2: Convert to fraction form
    20,470.78/30,720.75 = 8,787.34/x
  3. Step 3: Cross multiply
    20,470.78x = 30,720.75 × 8,787.34
  4. Step 4: Simplify right side
    20,470.78x = 269,953,675.31
  5. Step 5: Solve for x
    x = 269,953,675.31/20,470.78
  6. Step 6: Final answer
    x = 13,187.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.