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Finding the Fourth Proportional to 431,637.80, 647,456.70 and 265,519.40

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Solution

The fourth proportional to 431,637.80, 647,456.70 and 265,519.40 is: 398,279.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,637.80 : 647,456.70 = 265,519.40 : x
  2. Step 2: Convert to fraction form
    431,637.80/647,456.70 = 265,519.40/x
  3. Step 3: Cross multiply
    431,637.80x = 647,456.70 × 265,519.40
  4. Step 4: Simplify right side
    431,637.80x = 171,912,314,509.98
  5. Step 5: Solve for x
    x = 171,912,314,509.98/431,637.80
  6. Step 6: Final answer
    x = 398,279.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.