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Finding the Fourth Proportional to 70,137.32, 96,785.58 and 39,930

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Solution

The fourth proportional to 70,137.32, 96,785.58 and 39,930 is: 55,101.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,137.32 : 96,785.58 = 39,930 : x
  2. Step 2: Convert to fraction form
    70,137.32/96,785.58 = 39,930/x
  3. Step 3: Cross multiply
    70,137.32x = 96,785.58 × 39,930
  4. Step 4: Simplify right side
    70,137.32x = 3,864,648,209.40
  5. Step 5: Solve for x
    x = 3,864,648,209.40/70,137.32
  6. Step 6: Final answer
    x = 55,101.17

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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.