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Finding the Fourth Proportional to 265,613.58, 398,478.69 and 78,639.66

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Solution

The fourth proportional to 265,613.58, 398,478.69 and 78,639.66 is: 117,976.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,613.58 : 398,478.69 = 78,639.66 : x
  2. Step 2: Convert to fraction form
    265,613.58/398,478.69 = 78,639.66/x
  3. Step 3: Cross multiply
    265,613.58x = 398,478.69 × 78,639.66
  4. Step 4: Simplify right side
    265,613.58x = 31,336,228,698.85
  5. Step 5: Solve for x
    x = 31,336,228,698.85/265,613.58
  6. Step 6: Final answer
    x = 117,976.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.