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Finding the Fourth Proportional to 158,686.84, 218,987.83 and 90,705.28

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Solution

The fourth proportional to 158,686.84, 218,987.83 and 90,705.28 is: 125,173.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,686.84 : 218,987.83 = 90,705.28 : x
  2. Step 2: Convert to fraction form
    158,686.84/218,987.83 = 90,705.28/x
  3. Step 3: Cross multiply
    158,686.84x = 218,987.83 × 90,705.28
  4. Step 4: Simplify right side
    158,686.84x = 19,863,352,436.74
  5. Step 5: Solve for x
    x = 19,863,352,436.74/158,686.84
  6. Step 6: Final answer
    x = 125,173.28

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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.