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Finding the Fourth Proportional to 1,305.63, 1,957.80 and 612.62

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Solution

The fourth proportional to 1,305.63, 1,957.80 and 612.62 is: 918.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.63 : 1,957.80 = 612.62 : x
  2. Step 2: Convert to fraction form
    1,305.63/1,957.80 = 612.62/x
  3. Step 3: Cross multiply
    1,305.63x = 1,957.80 × 612.62
  4. Step 4: Simplify right side
    1,305.63x = 1,199,392.33
  5. Step 5: Solve for x
    x = 1,199,392.33/1,305.63
  6. Step 6: Final answer
    x = 918.63

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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.