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Finding the Fourth Proportional to 208,512.40, 312,695.70 and 108,639.40

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Solution

The fourth proportional to 208,512.40, 312,695.70 and 108,639.40 is: 162,921.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,512.40 : 312,695.70 = 108,639.40 : x
  2. Step 2: Convert to fraction form
    208,512.40/312,695.70 = 108,639.40/x
  3. Step 3: Cross multiply
    208,512.40x = 312,695.70 × 108,639.40
  4. Step 4: Simplify right side
    208,512.40x = 33,971,073,230.58
  5. Step 5: Solve for x
    x = 33,971,073,230.58/208,512.40
  6. Step 6: Final answer
    x = 162,921.12

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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.