Home / 12,345.60-18,518.40-3,111.60

Finding the Fourth Proportional to 12,345.60, 18,518.40 and 3,111.60

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Solution

The fourth proportional to 12,345.60, 18,518.40 and 3,111.60 is: 4,667.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,345.60 : 18,518.40 = 3,111.60 : x
  2. Step 2: Convert to fraction form
    12,345.60/18,518.40 = 3,111.60/x
  3. Step 3: Cross multiply
    12,345.60x = 18,518.40 × 3,111.60
  4. Step 4: Simplify right side
    12,345.60x = 57,621,853.44
  5. Step 5: Solve for x
    x = 57,621,853.44/12,345.60
  6. Step 6: Final answer
    x = 4,667.40

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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.