Home / 13,113.60-19,670.40-12,400.80

Finding the Fourth Proportional to 13,113.60, 19,670.40 and 12,400.80

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Solution

The fourth proportional to 13,113.60, 19,670.40 and 12,400.80 is: 18,601.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,113.60 : 19,670.40 = 12,400.80 : x
  2. Step 2: Convert to fraction form
    13,113.60/19,670.40 = 12,400.80/x
  3. Step 3: Cross multiply
    13,113.60x = 19,670.40 × 12,400.80
  4. Step 4: Simplify right side
    13,113.60x = 243,928,696.32
  5. Step 5: Solve for x
    x = 243,928,696.32/13,113.60
  6. Step 6: Final answer
    x = 18,601.20

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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.