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Finding the Fourth Proportional to 13,420.79, 18,520.62 and 7,371.15

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Solution

The fourth proportional to 13,420.79, 18,520.62 and 7,371.15 is: 10,172.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.79 : 18,520.62 = 7,371.15 : x
  2. Step 2: Convert to fraction form
    13,420.79/18,520.62 = 7,371.15/x
  3. Step 3: Cross multiply
    13,420.79x = 18,520.62 × 7,371.15
  4. Step 4: Simplify right side
    13,420.79x = 136,518,268.11
  5. Step 5: Solve for x
    x = 136,518,268.11/13,420.79
  6. Step 6: Final answer
    x = 10,172.15

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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.