Home / 129,367.12-178,512.18-72,777.28

Finding the Fourth Proportional to 129,367.12, 178,512.18 and 72,777.28

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Solution

The fourth proportional to 129,367.12, 178,512.18 and 72,777.28 is: 100,424.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,367.12 : 178,512.18 = 72,777.28 : x
  2. Step 2: Convert to fraction form
    129,367.12/178,512.18 = 72,777.28/x
  3. Step 3: Cross multiply
    129,367.12x = 178,512.18 × 72,777.28
  4. Step 4: Simplify right side
    129,367.12x = 12,991,630,907.27
  5. Step 5: Solve for x
    x = 12,991,630,907.27/129,367.12
  6. Step 6: Final answer
    x = 100,424.52

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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.