Home / 21,515.40-32,284.08-12,643.56

Finding the Fourth Proportional to 21,515.40, 32,284.08 and 12,643.56

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Solution

The fourth proportional to 21,515.40, 32,284.08 and 12,643.56 is: 18,971.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,515.40 : 32,284.08 = 12,643.56 : x
  2. Step 2: Convert to fraction form
    21,515.40/32,284.08 = 12,643.56/x
  3. Step 3: Cross multiply
    21,515.40x = 32,284.08 × 12,643.56
  4. Step 4: Simplify right side
    21,515.40x = 408,185,702.52
  5. Step 5: Solve for x
    x = 408,185,702.52/21,515.40
  6. Step 6: Final answer
    x = 18,971.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.