Home / 12,690.81-17,521.26-8,155.33

Finding the Fourth Proportional to 12,690.81, 17,521.26 and 8,155.33

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Solution

The fourth proportional to 12,690.81, 17,521.26 and 8,155.33 is: 11,259.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690.81 : 17,521.26 = 8,155.33 : x
  2. Step 2: Convert to fraction form
    12,690.81/17,521.26 = 8,155.33/x
  3. Step 3: Cross multiply
    12,690.81x = 17,521.26 × 8,155.33
  4. Step 4: Simplify right side
    12,690.81x = 142,891,657.32
  5. Step 5: Solve for x
    x = 142,891,657.32/12,690.81
  6. Step 6: Final answer
    x = 11,259.46

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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.