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Finding the Fourth Proportional to 312,395.13, 431,104.68 and 169,155.60

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Solution

The fourth proportional to 312,395.13, 431,104.68 and 169,155.60 is: 233,434.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,395.13 : 431,104.68 = 169,155.60 : x
  2. Step 2: Convert to fraction form
    312,395.13/431,104.68 = 169,155.60/x
  3. Step 3: Cross multiply
    312,395.13x = 431,104.68 × 169,155.60
  4. Step 4: Simplify right side
    312,395.13x = 72,923,770,808.21
  5. Step 5: Solve for x
    x = 72,923,770,808.21/312,395.13
  6. Step 6: Final answer
    x = 233,434.40

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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.