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Finding the Fourth Proportional to 620.40, 927.92 and 555.92

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Solution

The fourth proportional to 620.40, 927.92 and 555.92 is: 831.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.40 : 927.92 = 555.92 : x
  2. Step 2: Convert to fraction form
    620.40/927.92 = 555.92/x
  3. Step 3: Cross multiply
    620.40x = 927.92 × 555.92
  4. Step 4: Simplify right side
    620.40x = 515,849.29
  5. Step 5: Solve for x
    x = 515,849.29/620.40
  6. Step 6: Final answer
    x = 831.48

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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.