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Finding the Fourth Proportional to 19,243.65, 28,813.34 and 9,990.21

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Solution

The fourth proportional to 19,243.65, 28,813.34 and 9,990.21 is: 14,958.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,243.65 : 28,813.34 = 9,990.21 : x
  2. Step 2: Convert to fraction form
    19,243.65/28,813.34 = 9,990.21/x
  3. Step 3: Cross multiply
    19,243.65x = 28,813.34 × 9,990.21
  4. Step 4: Simplify right side
    19,243.65x = 287,851,267.45
  5. Step 5: Solve for x
    x = 287,851,267.45/19,243.65
  6. Step 6: Final answer
    x = 14,958.25

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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.