Home / 15,434.78-21,300.80-8,720.69

Finding the Fourth Proportional to 15,434.78, 21,300.80 and 8,720.69

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Solution

The fourth proportional to 15,434.78, 21,300.80 and 8,720.69 is: 12,035.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,434.78 : 21,300.80 = 8,720.69 : x
  2. Step 2: Convert to fraction form
    15,434.78/21,300.80 = 8,720.69/x
  3. Step 3: Cross multiply
    15,434.78x = 21,300.80 × 8,720.69
  4. Step 4: Simplify right side
    15,434.78x = 185,757,523.44
  5. Step 5: Solve for x
    x = 185,757,523.44/15,434.78
  6. Step 6: Final answer
    x = 12,035.00

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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.