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Finding the Fourth Proportional to 318,673.08, 438,820.38 and 311,600.88

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Solution

The fourth proportional to 318,673.08, 438,820.38 and 311,600.88 is: 429,081.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,673.08 : 438,820.38 = 311,600.88 : x
  2. Step 2: Convert to fraction form
    318,673.08/438,820.38 = 311,600.88/x
  3. Step 3: Cross multiply
    318,673.08x = 438,820.38 × 311,600.88
  4. Step 4: Simplify right side
    318,673.08x = 136,736,816,569.93
  5. Step 5: Solve for x
    x = 136,736,816,569.93/318,673.08
  6. Step 6: Final answer
    x = 429,081.79

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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.