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Finding the Fourth Proportional to 70,205.21, 96,869.75 and 39,989.87

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Solution

The fourth proportional to 70,205.21, 96,869.75 and 39,989.87 is: 55,178.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,205.21 : 96,869.75 = 39,989.87 : x
  2. Step 2: Convert to fraction form
    70,205.21/96,869.75 = 39,989.87/x
  3. Step 3: Cross multiply
    70,205.21x = 96,869.75 × 39,989.87
  4. Step 4: Simplify right side
    70,205.21x = 3,873,808,025.13
  5. Step 5: Solve for x
    x = 3,873,808,025.13/70,205.21
  6. Step 6: Final answer
    x = 55,178.36

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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.