Home / 20,710.58-31,065.48-5,128.20

Finding the Fourth Proportional to 20,710.58, 31,065.48 and 5,128.20

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Solution

The fourth proportional to 20,710.58, 31,065.48 and 5,128.20 is: 7,692.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,710.58 : 31,065.48 = 5,128.20 : x
  2. Step 2: Convert to fraction form
    20,710.58/31,065.48 = 5,128.20/x
  3. Step 3: Cross multiply
    20,710.58x = 31,065.48 × 5,128.20
  4. Step 4: Simplify right side
    20,710.58x = 159,309,994.54
  5. Step 5: Solve for x
    x = 159,309,994.54/20,710.58
  6. Step 6: Final answer
    x = 7,692.20

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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.