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Finding the Fourth Proportional to 128,978.20, 193,613.10 and 99,526.60

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Solution

The fourth proportional to 128,978.20, 193,613.10 and 99,526.60 is: 149,402.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,978.20 : 193,613.10 = 99,526.60 : x
  2. Step 2: Convert to fraction form
    128,978.20/193,613.10 = 99,526.60/x
  3. Step 3: Cross multiply
    128,978.20x = 193,613.10 × 99,526.60
  4. Step 4: Simplify right side
    128,978.20x = 19,269,653,558.46
  5. Step 5: Solve for x
    x = 19,269,653,558.46/128,978.20
  6. Step 6: Final answer
    x = 149,402.41

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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.