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Finding the Fourth Proportional to 312,558.80, 431,332.20 and 169,318.40

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Solution

The fourth proportional to 312,558.80, 431,332.20 and 169,318.40 is: 233,659.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,558.80 : 431,332.20 = 169,318.40 : x
  2. Step 2: Convert to fraction form
    312,558.80/431,332.20 = 169,318.40/x
  3. Step 3: Cross multiply
    312,558.80x = 431,332.20 × 169,318.40
  4. Step 4: Simplify right side
    312,558.80x = 73,032,477,972.48
  5. Step 5: Solve for x
    x = 73,032,477,972.48/312,558.80
  6. Step 6: Final answer
    x = 233,659.96

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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.