Home / 8,140.20-12,210.30-7,427.40

Finding the Fourth Proportional to 8,140.20, 12,210.30 and 7,427.40

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Solution

The fourth proportional to 8,140.20, 12,210.30 and 7,427.40 is: 11,141.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,140.20 : 12,210.30 = 7,427.40 : x
  2. Step 2: Convert to fraction form
    8,140.20/12,210.30 = 7,427.40/x
  3. Step 3: Cross multiply
    8,140.20x = 12,210.30 × 7,427.40
  4. Step 4: Simplify right side
    8,140.20x = 90,690,782.22
  5. Step 5: Solve for x
    x = 90,690,782.22/8,140.20
  6. Step 6: Final answer
    x = 11,141.10

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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.