Home / 21,360.78-29,478.72-12,286.13

Finding the Fourth Proportional to 21,360.78, 29,478.72 and 12,286.13

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Solution

The fourth proportional to 21,360.78, 29,478.72 and 12,286.13 is: 16,955.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,360.78 : 29,478.72 = 12,286.13 : x
  2. Step 2: Convert to fraction form
    21,360.78/29,478.72 = 12,286.13/x
  3. Step 3: Cross multiply
    21,360.78x = 29,478.72 × 12,286.13
  4. Step 4: Simplify right side
    21,360.78x = 362,179,312.46
  5. Step 5: Solve for x
    x = 362,179,312.46/21,360.78
  6. Step 6: Final answer
    x = 16,955.34

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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.