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Finding the Fourth Proportional to 13,143.60, 19,715.40 and 12,430.80

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Solution

The fourth proportional to 13,143.60, 19,715.40 and 12,430.80 is: 18,646.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,143.60 : 19,715.40 = 12,430.80 : x
  2. Step 2: Convert to fraction form
    13,143.60/19,715.40 = 12,430.80/x
  3. Step 3: Cross multiply
    13,143.60x = 19,715.40 × 12,430.80
  4. Step 4: Simplify right side
    13,143.60x = 245,078,194.32
  5. Step 5: Solve for x
    x = 245,078,194.32/13,143.60
  6. Step 6: Final answer
    x = 18,646.20

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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.