Home / 21,591.90-29,796.12-13,208.40

Finding the Fourth Proportional to 21,591.90, 29,796.12 and 13,208.40

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Solution

The fourth proportional to 21,591.90, 29,796.12 and 13,208.40 is: 18,227.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,591.90 : 29,796.12 = 13,208.40 : x
  2. Step 2: Convert to fraction form
    21,591.90/29,796.12 = 13,208.40/x
  3. Step 3: Cross multiply
    21,591.90x = 29,796.12 × 13,208.40
  4. Step 4: Simplify right side
    21,591.90x = 393,559,071.41
  5. Step 5: Solve for x
    x = 393,559,071.41/21,591.90
  6. Step 6: Final answer
    x = 18,227.16

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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.