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Finding the Fourth Proportional to 315,739.60, 473,206.20 and 128,539.60

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Solution

The fourth proportional to 315,739.60, 473,206.20 and 128,539.60 is: 192,645.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,739.60 : 473,206.20 = 128,539.60 : x
  2. Step 2: Convert to fraction form
    315,739.60/473,206.20 = 128,539.60/x
  3. Step 3: Cross multiply
    315,739.60x = 473,206.20 × 128,539.60
  4. Step 4: Simplify right side
    315,739.60x = 60,825,735,665.52
  5. Step 5: Solve for x
    x = 60,825,735,665.52/315,739.60
  6. Step 6: Final answer
    x = 192,645.25

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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.