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Finding the Fourth Proportional to 103,172.81, 142,403.81 and 62,908.79

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Solution

The fourth proportional to 103,172.81, 142,403.81 and 62,908.79 is: 86,829.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,172.81 : 142,403.81 = 62,908.79 : x
  2. Step 2: Convert to fraction form
    103,172.81/142,403.81 = 62,908.79/x
  3. Step 3: Cross multiply
    103,172.81x = 142,403.81 × 62,908.79
  4. Step 4: Simplify right side
    103,172.81x = 8,958,450,351.93
  5. Step 5: Solve for x
    x = 8,958,450,351.93/103,172.81
  6. Step 6: Final answer
    x = 86,829.57

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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.