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Finding the Fourth Proportional to 15,435.60, 21,300.96 and 8,361.60

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Solution

The fourth proportional to 15,435.60, 21,300.96 and 8,361.60 is: 11,538.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,435.60 : 21,300.96 = 8,361.60 : x
  2. Step 2: Convert to fraction form
    15,435.60/21,300.96 = 8,361.60/x
  3. Step 3: Cross multiply
    15,435.60x = 21,300.96 × 8,361.60
  4. Step 4: Simplify right side
    15,435.60x = 178,110,107.14
  5. Step 5: Solve for x
    x = 178,110,107.14/15,435.60
  6. Step 6: Final answer
    x = 11,538.92

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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.