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Finding the Fourth Proportional to 18,970.88, 28,433.28 and 9,720.32

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Solution

The fourth proportional to 18,970.88, 28,433.28 and 9,720.32 is: 14,568.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,970.88 : 28,433.28 = 9,720.32 : x
  2. Step 2: Convert to fraction form
    18,970.88/28,433.28 = 9,720.32/x
  3. Step 3: Cross multiply
    18,970.88x = 28,433.28 × 9,720.32
  4. Step 4: Simplify right side
    18,970.88x = 276,380,580.25
  5. Step 5: Solve for x
    x = 276,380,580.25/18,970.88
  6. Step 6: Final answer
    x = 14,568.67

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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.