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Finding the Fourth Proportional to 18,488.20, 27,749.70 and 9,729.40

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Solution

The fourth proportional to 18,488.20, 27,749.70 and 9,729.40 is: 14,603.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,488.20 : 27,749.70 = 9,729.40 : x
  2. Step 2: Convert to fraction form
    18,488.20/27,749.70 = 9,729.40/x
  3. Step 3: Cross multiply
    18,488.20x = 27,749.70 × 9,729.40
  4. Step 4: Simplify right side
    18,488.20x = 269,987,931.18
  5. Step 5: Solve for x
    x = 269,987,931.18/18,488.20
  6. Step 6: Final answer
    x = 14,603.26

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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.