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Finding the Fourth Proportional to 13,720.71, 18,935.53 and 8,345.25

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Solution

The fourth proportional to 13,720.71, 18,935.53 and 8,345.25 is: 11,517.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.71 : 18,935.53 = 8,345.25 : x
  2. Step 2: Convert to fraction form
    13,720.71/18,935.53 = 8,345.25/x
  3. Step 3: Cross multiply
    13,720.71x = 18,935.53 × 8,345.25
  4. Step 4: Simplify right side
    13,720.71x = 158,021,639.86
  5. Step 5: Solve for x
    x = 158,021,639.86/13,720.71
  6. Step 6: Final answer
    x = 11,517.02

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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.