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Finding the Fourth Proportional to 125,639.80, 188,459.70 and 105,956.80

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Solution

The fourth proportional to 125,639.80, 188,459.70 and 105,956.80 is: 158,935.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,639.80 : 188,459.70 = 105,956.80 : x
  2. Step 2: Convert to fraction form
    125,639.80/188,459.70 = 105,956.80/x
  3. Step 3: Cross multiply
    125,639.80x = 188,459.70 × 105,956.80
  4. Step 4: Simplify right side
    125,639.80x = 19,968,586,740.96
  5. Step 5: Solve for x
    x = 19,968,586,740.96/125,639.80
  6. Step 6: Final answer
    x = 158,935.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.