Home / 21,858.39-30,157.74-12,909.06

Finding the Fourth Proportional to 21,858.39, 30,157.74 and 12,909.06

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Solution

The fourth proportional to 21,858.39, 30,157.74 and 12,909.06 is: 17,810.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,858.39 : 30,157.74 = 12,909.06 : x
  2. Step 2: Convert to fraction form
    21,858.39/30,157.74 = 12,909.06/x
  3. Step 3: Cross multiply
    21,858.39x = 30,157.74 × 12,909.06
  4. Step 4: Simplify right side
    21,858.39x = 389,308,075.12
  5. Step 5: Solve for x
    x = 389,308,075.12/21,858.39
  6. Step 6: Final answer
    x = 17,810.46

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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.