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Finding the Fourth Proportional to 128,685.66, 193,045.44 and 47,621.58

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Solution

The fourth proportional to 128,685.66, 193,045.44 and 47,621.58 is: 71,438.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,685.66 : 193,045.44 = 47,621.58 : x
  2. Step 2: Convert to fraction form
    128,685.66/193,045.44 = 47,621.58/x
  3. Step 3: Cross multiply
    128,685.66x = 193,045.44 × 47,621.58
  4. Step 4: Simplify right side
    128,685.66x = 9,193,128,864.60
  5. Step 5: Solve for x
    x = 9,193,128,864.60/128,685.66
  6. Step 6: Final answer
    x = 71,438.64

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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.