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Finding the Fourth Proportional to 158,378.28, 218,565.56 and 90,393.92

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Solution

The fourth proportional to 158,378.28, 218,565.56 and 90,393.92 is: 124,745.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,378.28 : 218,565.56 = 90,393.92 : x
  2. Step 2: Convert to fraction form
    158,378.28/218,565.56 = 90,393.92/x
  3. Step 3: Cross multiply
    158,378.28x = 218,565.56 × 90,393.92
  4. Step 4: Simplify right side
    158,378.28x = 19,756,997,745.40
  5. Step 5: Solve for x
    x = 19,756,997,745.40/158,378.28
  6. Step 6: Final answer
    x = 124,745.63

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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.