Home / 76,639.15-105,702.11-49,790.31

Finding the Fourth Proportional to 76,639.15, 105,702.11 and 49,790.31

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Solution

The fourth proportional to 76,639.15, 105,702.11 and 49,790.31 is: 68,671.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,639.15 : 105,702.11 = 49,790.31 : x
  2. Step 2: Convert to fraction form
    76,639.15/105,702.11 = 49,790.31/x
  3. Step 3: Cross multiply
    76,639.15x = 105,702.11 × 49,790.31
  4. Step 4: Simplify right side
    76,639.15x = 5,262,940,365.93
  5. Step 5: Solve for x
    x = 5,262,940,365.93/76,639.15
  6. Step 6: Final answer
    x = 68,671.69

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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.