Home / 9,420.20-12,999.90-5,228.45

Finding the Fourth Proportional to 9,420.20, 12,999.90 and 5,228.45

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Solution

The fourth proportional to 9,420.20, 12,999.90 and 5,228.45 is: 7,215.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,420.20 : 12,999.90 = 5,228.45 : x
  2. Step 2: Convert to fraction form
    9,420.20/12,999.90 = 5,228.45/x
  3. Step 3: Cross multiply
    9,420.20x = 12,999.90 × 5,228.45
  4. Step 4: Simplify right side
    9,420.20x = 67,969,262.16
  5. Step 5: Solve for x
    x = 67,969,262.16/9,420.20
  6. Step 6: Final answer
    x = 7,215.27

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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.