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Finding the Fourth Proportional to 13,368.80, 18,430.80 and 12,785.60

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Solution

The fourth proportional to 13,368.80, 18,430.80 and 12,785.60 is: 17,626.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,368.80 : 18,430.80 = 12,785.60 : x
  2. Step 2: Convert to fraction form
    13,368.80/18,430.80 = 12,785.60/x
  3. Step 3: Cross multiply
    13,368.80x = 18,430.80 × 12,785.60
  4. Step 4: Simplify right side
    13,368.80x = 235,648,836.48
  5. Step 5: Solve for x
    x = 235,648,836.48/13,368.80
  6. Step 6: Final answer
    x = 17,626.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.