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Finding the Fourth Proportional to 128,905.48, 193,129.34 and 53,860.42

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Solution

The fourth proportional to 128,905.48, 193,129.34 and 53,860.42 is: 80,695.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,905.48 : 193,129.34 = 53,860.42 : x
  2. Step 2: Convert to fraction form
    128,905.48/193,129.34 = 53,860.42/x
  3. Step 3: Cross multiply
    128,905.48x = 193,129.34 × 53,860.42
  4. Step 4: Simplify right side
    128,905.48x = 10,402,027,366.72
  5. Step 5: Solve for x
    x = 10,402,027,366.72/128,905.48
  6. Step 6: Final answer
    x = 80,695.00

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1.5x scale

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.