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Finding the Fourth Proportional to 105,129, 157,759.11 and 42,799.50

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Solution

The fourth proportional to 105,129, 157,759.11 and 42,799.50 is: 64,225.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,129 : 157,759.11 = 42,799.50 : x
  2. Step 2: Convert to fraction form
    105,129/157,759.11 = 42,799.50/x
  3. Step 3: Cross multiply
    105,129x = 157,759.11 × 42,799.50
  4. Step 4: Simplify right side
    105,129x = 6,752,011,028.45
  5. Step 5: Solve for x
    x = 6,752,011,028.45/105,129
  6. Step 6: Final answer
    x = 64,225.96

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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.