Home / 15,840.80-21,860.30-8,670.71

Finding the Fourth Proportional to 15,840.80, 21,860.30 and 8,670.71

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Solution

The fourth proportional to 15,840.80, 21,860.30 and 8,670.71 is: 11,965.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,840.80 : 21,860.30 = 8,670.71 : x
  2. Step 2: Convert to fraction form
    15,840.80/21,860.30 = 8,670.71/x
  3. Step 3: Cross multiply
    15,840.80x = 21,860.30 × 8,670.71
  4. Step 4: Simplify right side
    15,840.80x = 189,544,321.81
  5. Step 5: Solve for x
    x = 189,544,321.81/15,840.80
  6. Step 6: Final answer
    x = 11,965.58

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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.