Home / 129,438.12-178,630.98-72,855.72

Finding the Fourth Proportional to 129,438.12, 178,630.98 and 72,855.72

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Solution

The fourth proportional to 129,438.12, 178,630.98 and 72,855.72 is: 100,544.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,438.12 : 178,630.98 = 72,855.72 : x
  2. Step 2: Convert to fraction form
    129,438.12/178,630.98 = 72,855.72/x
  3. Step 3: Cross multiply
    129,438.12x = 178,630.98 × 72,855.72
  4. Step 4: Simplify right side
    129,438.12x = 13,014,288,662.21
  5. Step 5: Solve for x
    x = 13,014,288,662.21/129,438.12
  6. Step 6: Final answer
    x = 100,544.48

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1.5x scale

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.