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Finding the Fourth Proportional to 15,808.80, 21,816.36 and 8,735.20

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Solution

The fourth proportional to 15,808.80, 21,816.36 and 8,735.20 is: 12,054.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,808.80 : 21,816.36 = 8,735.20 : x
  2. Step 2: Convert to fraction form
    15,808.80/21,816.36 = 8,735.20/x
  3. Step 3: Cross multiply
    15,808.80x = 21,816.36 × 8,735.20
  4. Step 4: Simplify right side
    15,808.80x = 190,570,267.87
  5. Step 5: Solve for x
    x = 190,570,267.87/15,808.80
  6. Step 6: Final answer
    x = 12,054.70

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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.