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Finding the Fourth Proportional to 128,465.80, 192,689.10 and 53,566.60

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Solution

The fourth proportional to 128,465.80, 192,689.10 and 53,566.60 is: 80,345.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,465.80 : 192,689.10 = 53,566.60 : x
  2. Step 2: Convert to fraction form
    128,465.80/192,689.10 = 53,566.60/x
  3. Step 3: Cross multiply
    128,465.80x = 192,689.10 × 53,566.60
  4. Step 4: Simplify right side
    128,465.80x = 10,321,699,944.06
  5. Step 5: Solve for x
    x = 10,321,699,944.06/128,465.80
  6. Step 6: Final answer
    x = 80,345.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.