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Finding the Fourth Proportional to 129,643.84, 178,907.44 and 72,282.48

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Solution

The fourth proportional to 129,643.84, 178,907.44 and 72,282.48 is: 99,749.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,643.84 : 178,907.44 = 72,282.48 : x
  2. Step 2: Convert to fraction form
    129,643.84/178,907.44 = 72,282.48/x
  3. Step 3: Cross multiply
    129,643.84x = 178,907.44 × 72,282.48
  4. Step 4: Simplify right side
    129,643.84x = 12,931,873,453.65
  5. Step 5: Solve for x
    x = 12,931,873,453.65/129,643.84
  6. Step 6: Final answer
    x = 99,749.23

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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.