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Finding the Fourth Proportional to 129,775.83, 179,048.71 and 72,405.85

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Solution

The fourth proportional to 129,775.83, 179,048.71 and 72,405.85 is: 99,896.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,775.83 : 179,048.71 = 72,405.85 : x
  2. Step 2: Convert to fraction form
    129,775.83/179,048.71 = 72,405.85/x
  3. Step 3: Cross multiply
    129,775.83x = 179,048.71 × 72,405.85
  4. Step 4: Simplify right side
    129,775.83x = 12,964,174,038.95
  5. Step 5: Solve for x
    x = 12,964,174,038.95/129,775.83
  6. Step 6: Final answer
    x = 99,896.68

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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.