Home / 12,289.40-18,425.10-4,890.20

Finding the Fourth Proportional to 12,289.40, 18,425.10 and 4,890.20

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Solution

The fourth proportional to 12,289.40, 18,425.10 and 4,890.20 is: 7,331.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,289.40 : 18,425.10 = 4,890.20 : x
  2. Step 2: Convert to fraction form
    12,289.40/18,425.10 = 4,890.20/x
  3. Step 3: Cross multiply
    12,289.40x = 18,425.10 × 4,890.20
  4. Step 4: Simplify right side
    12,289.40x = 90,102,424.02
  5. Step 5: Solve for x
    x = 90,102,424.02/12,289.40
  6. Step 6: Final answer
    x = 7,331.72

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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.