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Finding the Fourth Proportional to 18,638.61, 25,716.18 and 12,966.99

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Solution

The fourth proportional to 18,638.61, 25,716.18 and 12,966.99 is: 17,890.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,638.61 : 25,716.18 = 12,966.99 : x
  2. Step 2: Convert to fraction form
    18,638.61/25,716.18 = 12,966.99/x
  3. Step 3: Cross multiply
    18,638.61x = 25,716.18 × 12,966.99
  4. Step 4: Simplify right side
    18,638.61x = 333,461,448.90
  5. Step 5: Solve for x
    x = 333,461,448.90/18,638.61
  6. Step 6: Final answer
    x = 17,890.90

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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.