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Finding the Fourth Proportional to 105,511.80, 145,825.74 and 84,516.60

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Solution

The fourth proportional to 105,511.80, 145,825.74 and 84,516.60 is: 116,808.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,511.80 : 145,825.74 = 84,516.60 : x
  2. Step 2: Convert to fraction form
    105,511.80/145,825.74 = 84,516.60/x
  3. Step 3: Cross multiply
    105,511.80x = 145,825.74 × 84,516.60
  4. Step 4: Simplify right side
    105,511.80x = 12,324,695,737.28
  5. Step 5: Solve for x
    x = 12,324,695,737.28/105,511.80
  6. Step 6: Final answer
    x = 116,808.70

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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.