Home / 21,078.90-29,090.79-11,650.50

Finding the Fourth Proportional to 21,078.90, 29,090.79 and 11,650.50

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Solution

The fourth proportional to 21,078.90, 29,090.79 and 11,650.50 is: 16,078.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.90 : 29,090.79 = 11,650.50 : x
  2. Step 2: Convert to fraction form
    21,078.90/29,090.79 = 11,650.50/x
  3. Step 3: Cross multiply
    21,078.90x = 29,090.79 × 11,650.50
  4. Step 4: Simplify right side
    21,078.90x = 338,922,248.90
  5. Step 5: Solve for x
    x = 338,922,248.90/21,078.90
  6. Step 6: Final answer
    x = 16,078.74

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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.