Home / 20,698.72-28,509.82-15,909.51

Finding the Fourth Proportional to 20,698.72, 28,509.82 and 15,909.51

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Solution

The fourth proportional to 20,698.72, 28,509.82 and 15,909.51 is: 21,913.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,698.72 : 28,509.82 = 15,909.51 : x
  2. Step 2: Convert to fraction form
    20,698.72/28,509.82 = 15,909.51/x
  3. Step 3: Cross multiply
    20,698.72x = 28,509.82 × 15,909.51
  4. Step 4: Simplify right side
    20,698.72x = 453,577,266.39
  5. Step 5: Solve for x
    x = 453,577,266.39/20,698.72
  6. Step 6: Final answer
    x = 21,913.30

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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.