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Finding the Fourth Proportional to 280,679.26, 387,336.72 and 153,355.81

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Solution

The fourth proportional to 280,679.26, 387,336.72 and 153,355.81 is: 211,630.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,679.26 : 387,336.72 = 153,355.81 : x
  2. Step 2: Convert to fraction form
    280,679.26/387,336.72 = 153,355.81/x
  3. Step 3: Cross multiply
    280,679.26x = 387,336.72 × 153,355.81
  4. Step 4: Simplify right side
    280,679.26x = 59,400,336,438.34
  5. Step 5: Solve for x
    x = 59,400,336,438.34/280,679.26
  6. Step 6: Final answer
    x = 211,630.66

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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.