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Finding the Fourth Proportional to 621.76, 857.80 and 369.62

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Solution

The fourth proportional to 621.76, 857.80 and 369.62 is: 509.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.76 : 857.80 = 369.62 : x
  2. Step 2: Convert to fraction form
    621.76/857.80 = 369.62/x
  3. Step 3: Cross multiply
    621.76x = 857.80 × 369.62
  4. Step 4: Simplify right side
    621.76x = 317,060.04
  5. Step 5: Solve for x
    x = 317,060.04/621.76
  6. Step 6: Final answer
    x = 509.94

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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.