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Finding the Fourth Proportional to 76,959.75, 106,218.90 and 45,128.64

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Solution

The fourth proportional to 76,959.75, 106,218.90 and 45,128.64 is: 62,285.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,959.75 : 106,218.90 = 45,128.64 : x
  2. Step 2: Convert to fraction form
    76,959.75/106,218.90 = 45,128.64/x
  3. Step 3: Cross multiply
    76,959.75x = 106,218.90 × 45,128.64
  4. Step 4: Simplify right side
    76,959.75x = 4,793,514,499.30
  5. Step 5: Solve for x
    x = 4,793,514,499.30/76,959.75
  6. Step 6: Final answer
    x = 62,285.99

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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.