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Finding the Fourth Proportional to 513,908.72, 709,213.92 and 287,549.36

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Solution

The fourth proportional to 513,908.72, 709,213.92 and 287,549.36 is: 396,829.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    513,908.72 : 709,213.92 = 287,549.36 : x
  2. Step 2: Convert to fraction form
    513,908.72/709,213.92 = 287,549.36/x
  3. Step 3: Cross multiply
    513,908.72x = 709,213.92 × 287,549.36
  4. Step 4: Simplify right side
    513,908.72x = 203,934,008,799.09
  5. Step 5: Solve for x
    x = 203,934,008,799.09/513,908.72
  6. Step 6: Final answer
    x = 396,829.24

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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.