Home / 12,138.18-18,209.10-4,345.20

Finding the Fourth Proportional to 12,138.18, 18,209.10 and 4,345.20

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Solution

The fourth proportional to 12,138.18, 18,209.10 and 4,345.20 is: 6,518.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.18 : 18,209.10 = 4,345.20 : x
  2. Step 2: Convert to fraction form
    12,138.18/18,209.10 = 4,345.20/x
  3. Step 3: Cross multiply
    12,138.18x = 18,209.10 × 4,345.20
  4. Step 4: Simplify right side
    12,138.18x = 79,122,181.32
  5. Step 5: Solve for x
    x = 79,122,181.32/12,138.18
  6. Step 6: Final answer
    x = 6,518.46

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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.