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Finding the Fourth Proportional to 19,321.60, 28,991.70 and 9,455.50

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Solution

The fourth proportional to 19,321.60, 28,991.70 and 9,455.50 is: 14,187.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,321.60 : 28,991.70 = 9,455.50 : x
  2. Step 2: Convert to fraction form
    19,321.60/28,991.70 = 9,455.50/x
  3. Step 3: Cross multiply
    19,321.60x = 28,991.70 × 9,455.50
  4. Step 4: Simplify right side
    19,321.60x = 274,131,019.35
  5. Step 5: Solve for x
    x = 274,131,019.35/19,321.60
  6. Step 6: Final answer
    x = 14,187.80

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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.