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Finding the Fourth Proportional to 105,559, 145,673 and 57,816.80

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Solution

The fourth proportional to 105,559, 145,673 and 57,816.80 is: 79,788.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,559 : 145,673 = 57,816.80 : x
  2. Step 2: Convert to fraction form
    105,559/145,673 = 57,816.80/x
  3. Step 3: Cross multiply
    105,559x = 145,673 × 57,816.80
  4. Step 4: Simplify right side
    105,559x = 8,422,346,706.40
  5. Step 5: Solve for x
    x = 8,422,346,706.40/105,559
  6. Step 6: Final answer
    x = 79,788.05

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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.