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Finding the Fourth Proportional to 128,989.68, 193,493.05 and 34,218.53

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Solution

The fourth proportional to 128,989.68, 193,493.05 and 34,218.53 is: 51,330.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,989.68 : 193,493.05 = 34,218.53 : x
  2. Step 2: Convert to fraction form
    128,989.68/193,493.05 = 34,218.53/x
  3. Step 3: Cross multiply
    128,989.68x = 193,493.05 × 34,218.53
  4. Step 4: Simplify right side
    128,989.68x = 6,621,048,689.68
  5. Step 5: Solve for x
    x = 6,621,048,689.68/128,989.68
  6. Step 6: Final answer
    x = 51,330.06

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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.