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Finding the Fourth Proportional to 55,129.68, 76,078.80 and 29,979

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Solution

The fourth proportional to 55,129.68, 76,078.80 and 29,979 is: 41,370.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,129.68 : 76,078.80 = 29,979 : x
  2. Step 2: Convert to fraction form
    55,129.68/76,078.80 = 29,979/x
  3. Step 3: Cross multiply
    55,129.68x = 76,078.80 × 29,979
  4. Step 4: Simplify right side
    55,129.68x = 2,280,766,345.20
  5. Step 5: Solve for x
    x = 2,280,766,345.20/55,129.68
  6. Step 6: Final answer
    x = 41,370.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.