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Finding the Fourth Proportional to 158,643.12, 218,925.44 and 90,659.32

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Solution

The fourth proportional to 158,643.12, 218,925.44 and 90,659.32 is: 125,108.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,643.12 : 218,925.44 = 90,659.32 : x
  2. Step 2: Convert to fraction form
    158,643.12/218,925.44 = 90,659.32/x
  3. Step 3: Cross multiply
    158,643.12x = 218,925.44 × 90,659.32
  4. Step 4: Simplify right side
    158,643.12x = 19,847,631,521.10
  5. Step 5: Solve for x
    x = 19,847,631,521.10/158,643.12
  6. Step 6: Final answer
    x = 125,108.68

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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.