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Finding the Fourth Proportional to 14,435.50, 19,920.99 and 7,811.50

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Solution

The fourth proportional to 14,435.50, 19,920.99 and 7,811.50 is: 10,779.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,435.50 : 19,920.99 = 7,811.50 : x
  2. Step 2: Convert to fraction form
    14,435.50/19,920.99 = 7,811.50/x
  3. Step 3: Cross multiply
    14,435.50x = 19,920.99 × 7,811.50
  4. Step 4: Simplify right side
    14,435.50x = 155,612,813.39
  5. Step 5: Solve for x
    x = 155,612,813.39/14,435.50
  6. Step 6: Final answer
    x = 10,779.87

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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.