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Finding the Fourth Proportional to 18,878.40, 26,056.80 and 11,428.80

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Solution

The fourth proportional to 18,878.40, 26,056.80 and 11,428.80 is: 15,774.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,878.40 : 26,056.80 = 11,428.80 : x
  2. Step 2: Convert to fraction form
    18,878.40/26,056.80 = 11,428.80/x
  3. Step 3: Cross multiply
    18,878.40x = 26,056.80 × 11,428.80
  4. Step 4: Simplify right side
    18,878.40x = 297,797,955.84
  5. Step 5: Solve for x
    x = 297,797,955.84/18,878.40
  6. Step 6: Final answer
    x = 15,774.53

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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.