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Finding the Fourth Proportional to 312,575.76, 431,211.60 and 185,178.96

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Solution

The fourth proportional to 312,575.76, 431,211.60 and 185,178.96 is: 255,462.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,575.76 : 431,211.60 = 185,178.96 : x
  2. Step 2: Convert to fraction form
    312,575.76/431,211.60 = 185,178.96/x
  3. Step 3: Cross multiply
    312,575.76x = 431,211.60 × 185,178.96
  4. Step 4: Simplify right side
    312,575.76x = 79,851,315,627.94
  5. Step 5: Solve for x
    x = 79,851,315,627.94/312,575.76
  6. Step 6: Final answer
    x = 255,462.28

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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.