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Finding the Fourth Proportional to 129,878.64, 179,230.82 and 72,518.94

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Solution

The fourth proportional to 129,878.64, 179,230.82 and 72,518.94 is: 100,075.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,878.64 : 179,230.82 = 72,518.94 : x
  2. Step 2: Convert to fraction form
    129,878.64/179,230.82 = 72,518.94/x
  3. Step 3: Cross multiply
    129,878.64x = 179,230.82 × 72,518.94
  4. Step 4: Simplify right side
    129,878.64x = 12,997,628,719.14
  5. Step 5: Solve for x
    x = 12,997,628,719.14/129,878.64
  6. Step 6: Final answer
    x = 100,075.18

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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.