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Finding the Fourth Proportional to 13,639.93, 18,822.98 and 7,671.64

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Solution

The fourth proportional to 13,639.93, 18,822.98 and 7,671.64 is: 10,586.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.93 : 18,822.98 = 7,671.64 : x
  2. Step 2: Convert to fraction form
    13,639.93/18,822.98 = 7,671.64/x
  3. Step 3: Cross multiply
    13,639.93x = 18,822.98 × 7,671.64
  4. Step 4: Simplify right side
    13,639.93x = 144,403,126.29
  5. Step 5: Solve for x
    x = 144,403,126.29/13,639.93
  6. Step 6: Final answer
    x = 10,586.79

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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.