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Finding the Fourth Proportional to 312,711.94, 431,588.80 and 198,001.25

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Solution

The fourth proportional to 312,711.94, 431,588.80 and 198,001.25 is: 273,271.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,711.94 : 431,588.80 = 198,001.25 : x
  2. Step 2: Convert to fraction form
    312,711.94/431,588.80 = 198,001.25/x
  3. Step 3: Cross multiply
    312,711.94x = 431,588.80 × 198,001.25
  4. Step 4: Simplify right side
    312,711.94x = 85,455,119,233.05
  5. Step 5: Solve for x
    x = 85,455,119,233.05/312,711.94
  6. Step 6: Final answer
    x = 273,271.05

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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.