Home / 15,435.35-21,300.80-8,720.99

Finding the Fourth Proportional to 15,435.35, 21,300.80 and 8,720.99

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Solution

The fourth proportional to 15,435.35, 21,300.80 and 8,720.99 is: 12,034.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,435.35 : 21,300.80 = 8,720.99 : x
  2. Step 2: Convert to fraction form
    15,435.35/21,300.80 = 8,720.99/x
  3. Step 3: Cross multiply
    15,435.35x = 21,300.80 × 8,720.99
  4. Step 4: Simplify right side
    15,435.35x = 185,764,020.19
  5. Step 5: Solve for x
    x = 185,764,020.19/15,435.35
  6. Step 6: Final answer
    x = 12,034.97

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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.