Home / 21,078.40-29,091.36-12,699.52

Finding the Fourth Proportional to 21,078.40, 29,091.36 and 12,699.52

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Solution

The fourth proportional to 21,078.40, 29,091.36 and 12,699.52 is: 17,527.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.40 : 29,091.36 = 12,699.52 : x
  2. Step 2: Convert to fraction form
    21,078.40/29,091.36 = 12,699.52/x
  3. Step 3: Cross multiply
    21,078.40x = 29,091.36 × 12,699.52
  4. Step 4: Simplify right side
    21,078.40x = 369,446,308.15
  5. Step 5: Solve for x
    x = 369,446,308.15/21,078.40
  6. Step 6: Final answer
    x = 17,527.25

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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.