Home / 129,509.85-178,676.18-78,485.77

Finding the Fourth Proportional to 129,509.85, 178,676.18 and 78,485.77

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Solution

The fourth proportional to 129,509.85, 178,676.18 and 78,485.77 is: 108,281.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,509.85 : 178,676.18 = 78,485.77 : x
  2. Step 2: Convert to fraction form
    129,509.85/178,676.18 = 78,485.77/x
  3. Step 3: Cross multiply
    129,509.85x = 178,676.18 × 78,485.77
  4. Step 4: Simplify right side
    129,509.85x = 14,023,538,134.68
  5. Step 5: Solve for x
    x = 14,023,538,134.68/129,509.85
  6. Step 6: Final answer
    x = 108,281.64

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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.