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Finding the Fourth Proportional to 103,728.69, 142,844.40 and 90,110.52

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Solution

The fourth proportional to 103,728.69, 142,844.40 and 90,110.52 is: 124,090.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,728.69 : 142,844.40 = 90,110.52 : x
  2. Step 2: Convert to fraction form
    103,728.69/142,844.40 = 90,110.52/x
  3. Step 3: Cross multiply
    103,728.69x = 142,844.40 × 90,110.52
  4. Step 4: Simplify right side
    103,728.69x = 12,871,783,163.09
  5. Step 5: Solve for x
    x = 12,871,783,163.09/103,728.69
  6. Step 6: Final answer
    x = 124,090.87

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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.