Home / 21,070.85-29,078.93-11,639.21

Finding the Fourth Proportional to 21,070.85, 29,078.93 and 11,639.21

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Solution

The fourth proportional to 21,070.85, 29,078.93 and 11,639.21 is: 16,062.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,070.85 : 29,078.93 = 11,639.21 : x
  2. Step 2: Convert to fraction form
    21,070.85/29,078.93 = 11,639.21/x
  3. Step 3: Cross multiply
    21,070.85x = 29,078.93 × 11,639.21
  4. Step 4: Simplify right side
    21,070.85x = 338,455,656.55
  5. Step 5: Solve for x
    x = 338,455,656.55/21,070.85
  6. Step 6: Final answer
    x = 16,062.75

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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.