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Finding the Fourth Proportional to 158,121, 218,218.84 and 90,139.60

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Solution

The fourth proportional to 158,121, 218,218.84 and 90,139.60 is: 124,399.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,121 : 218,218.84 = 90,139.60 : x
  2. Step 2: Convert to fraction form
    158,121/218,218.84 = 90,139.60/x
  3. Step 3: Cross multiply
    158,121x = 218,218.84 × 90,139.60
  4. Step 4: Simplify right side
    158,121x = 19,670,158,950.06
  5. Step 5: Solve for x
    x = 19,670,158,950.06/158,121
  6. Step 6: Final answer
    x = 124,399.41

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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.