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Finding the Fourth Proportional to 18,620.40, 27,938.70 and 9,386.40

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Solution

The fourth proportional to 18,620.40, 27,938.70 and 9,386.40 is: 14,083.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,620.40 : 27,938.70 = 9,386.40 : x
  2. Step 2: Convert to fraction form
    18,620.40/27,938.70 = 9,386.40/x
  3. Step 3: Cross multiply
    18,620.40x = 27,938.70 × 9,386.40
  4. Step 4: Simplify right side
    18,620.40x = 262,243,813.68
  5. Step 5: Solve for x
    x = 262,243,813.68/18,620.40
  6. Step 6: Final answer
    x = 14,083.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.