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Finding the Fourth Proportional to 312,518.72, 431,275.64 and 169,278.42

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Solution

The fourth proportional to 312,518.72, 431,275.64 and 169,278.42 is: 233,604.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,518.72 : 431,275.64 = 169,278.42 : x
  2. Step 2: Convert to fraction form
    312,518.72/431,275.64 = 169,278.42/x
  3. Step 3: Cross multiply
    312,518.72x = 431,275.64 × 169,278.42
  4. Step 4: Simplify right side
    312,518.72x = 73,005,658,923.69
  5. Step 5: Solve for x
    x = 73,005,658,923.69/312,518.72
  6. Step 6: Final answer
    x = 233,604.11

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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.