Home / 20,871.90-31,307.81-13,865.58

Finding the Fourth Proportional to 20,871.90, 31,307.81 and 13,865.58

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Solution

The fourth proportional to 20,871.90, 31,307.81 and 13,865.58 is: 20,798.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.90 : 31,307.81 = 13,865.58 : x
  2. Step 2: Convert to fraction form
    20,871.90/31,307.81 = 13,865.58/x
  3. Step 3: Cross multiply
    20,871.90x = 31,307.81 × 13,865.58
  4. Step 4: Simplify right side
    20,871.90x = 434,100,874.85
  5. Step 5: Solve for x
    x = 434,100,874.85/20,871.90
  6. Step 6: Final answer
    x = 20,798.34

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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.