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Finding the Fourth Proportional to 122,790.92, 169,447.80 and 74,421.47

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Solution

The fourth proportional to 122,790.92, 169,447.80 and 74,421.47 is: 102,699.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,790.92 : 169,447.80 = 74,421.47 : x
  2. Step 2: Convert to fraction form
    122,790.92/169,447.80 = 74,421.47/x
  3. Step 3: Cross multiply
    122,790.92x = 169,447.80 × 74,421.47
  4. Step 4: Simplify right side
    122,790.92x = 12,610,554,431.54
  5. Step 5: Solve for x
    x = 12,610,554,431.54/122,790.92
  6. Step 6: Final answer
    x = 102,699.40

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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.