Home / 21,461.88-29,610.32-12,960.78

Finding the Fourth Proportional to 21,461.88, 29,610.32 and 12,960.78

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Solution

The fourth proportional to 21,461.88, 29,610.32 and 12,960.78 is: 17,881.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,461.88 : 29,610.32 = 12,960.78 : x
  2. Step 2: Convert to fraction form
    21,461.88/29,610.32 = 12,960.78/x
  3. Step 3: Cross multiply
    21,461.88x = 29,610.32 × 12,960.78
  4. Step 4: Simplify right side
    21,461.88x = 383,772,778.45
  5. Step 5: Solve for x
    x = 383,772,778.45/21,461.88
  6. Step 6: Final answer
    x = 17,881.60

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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.