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Finding the Fourth Proportional to 61,278.40, 91,917.60 and 19,725.40

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Solution

The fourth proportional to 61,278.40, 91,917.60 and 19,725.40 is: 29,588.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,278.40 : 91,917.60 = 19,725.40 : x
  2. Step 2: Convert to fraction form
    61,278.40/91,917.60 = 19,725.40/x
  3. Step 3: Cross multiply
    61,278.40x = 91,917.60 × 19,725.40
  4. Step 4: Simplify right side
    61,278.40x = 1,813,111,427.04
  5. Step 5: Solve for x
    x = 1,813,111,427.04/61,278.40
  6. Step 6: Final answer
    x = 29,588.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.