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Finding the Fourth Proportional to 122,508.99, 169,080.75 and 74,790

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Solution

The fourth proportional to 122,508.99, 169,080.75 and 74,790 is: 103,221.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,508.99 : 169,080.75 = 74,790 : x
  2. Step 2: Convert to fraction form
    122,508.99/169,080.75 = 74,790/x
  3. Step 3: Cross multiply
    122,508.99x = 169,080.75 × 74,790
  4. Step 4: Simplify right side
    122,508.99x = 12,645,549,292.50
  5. Step 5: Solve for x
    x = 12,645,549,292.50/122,508.99
  6. Step 6: Final answer
    x = 103,221.40

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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.