Home / 21,435.84-29,585.60-12,939.36

Finding the Fourth Proportional to 21,435.84, 29,585.60 and 12,939.36

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Solution

The fourth proportional to 21,435.84, 29,585.60 and 12,939.36 is: 17,858.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,435.84 : 29,585.60 = 12,939.36 : x
  2. Step 2: Convert to fraction form
    21,435.84/29,585.60 = 12,939.36/x
  3. Step 3: Cross multiply
    21,435.84x = 29,585.60 × 12,939.36
  4. Step 4: Simplify right side
    21,435.84x = 382,818,729.22
  5. Step 5: Solve for x
    x = 382,818,729.22/21,435.84
  6. Step 6: Final answer
    x = 17,858.82

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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.