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Finding the Fourth Proportional to 621,279.81, 857,655 and 468,380.16

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Solution

The fourth proportional to 621,279.81, 857,655 and 468,380.16 is: 646,582.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,279.81 : 857,655 = 468,380.16 : x
  2. Step 2: Convert to fraction form
    621,279.81/857,655 = 468,380.16/x
  3. Step 3: Cross multiply
    621,279.81x = 857,655 × 468,380.16
  4. Step 4: Simplify right side
    621,279.81x = 401,708,586,124.80
  5. Step 5: Solve for x
    x = 401,708,586,124.80/621,279.81
  6. Step 6: Final answer
    x = 646,582.39

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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.