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Finding the Fourth Proportional to 619.63, 922.70 and 612.81

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Solution

The fourth proportional to 619.63, 922.70 and 612.81 is: 912.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.63 : 922.70 = 612.81 : x
  2. Step 2: Convert to fraction form
    619.63/922.70 = 612.81/x
  3. Step 3: Cross multiply
    619.63x = 922.70 × 612.81
  4. Step 4: Simplify right side
    619.63x = 565,441.32
  5. Step 5: Solve for x
    x = 565,441.32/619.63
  6. Step 6: Final answer
    x = 912.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.