Home / 20,705.07-31,017.51-12,391.64

Finding the Fourth Proportional to 20,705.07, 31,017.51 and 12,391.64

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Solution

The fourth proportional to 20,705.07, 31,017.51 and 12,391.64 is: 18,563.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,705.07 : 31,017.51 = 12,391.64 : x
  2. Step 2: Convert to fraction form
    20,705.07/31,017.51 = 12,391.64/x
  3. Step 3: Cross multiply
    20,705.07x = 31,017.51 × 12,391.64
  4. Step 4: Simplify right side
    20,705.07x = 384,357,817.62
  5. Step 5: Solve for x
    x = 384,357,817.62/20,705.07
  6. Step 6: Final answer
    x = 18,563.46

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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.