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Finding the Fourth Proportional to 100,373.54, 138,515.47 and 55,661.54

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Solution

The fourth proportional to 100,373.54, 138,515.47 and 55,661.54 is: 76,812.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,373.54 : 138,515.47 = 55,661.54 : x
  2. Step 2: Convert to fraction form
    100,373.54/138,515.47 = 55,661.54/x
  3. Step 3: Cross multiply
    100,373.54x = 138,515.47 × 55,661.54
  4. Step 4: Simplify right side
    100,373.54x = 7,709,984,374.02
  5. Step 5: Solve for x
    x = 7,709,984,374.02/100,373.54
  6. Step 6: Final answer
    x = 76,812.92

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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.