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Finding the Fourth Proportional to 128,979.81, 193,447.80 and 58,842.72

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Solution

The fourth proportional to 128,979.81, 193,447.80 and 58,842.72 is: 88,254.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,979.81 : 193,447.80 = 58,842.72 : x
  2. Step 2: Convert to fraction form
    128,979.81/193,447.80 = 58,842.72/x
  3. Step 3: Cross multiply
    128,979.81x = 193,447.80 × 58,842.72
  4. Step 4: Simplify right side
    128,979.81x = 11,382,994,730.02
  5. Step 5: Solve for x
    x = 11,382,994,730.02/128,979.81
  6. Step 6: Final answer
    x = 88,254.08

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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.