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Finding the Fourth Proportional to 1,306.56, 1,958.76 and 612.87

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Solution

The fourth proportional to 1,306.56, 1,958.76 and 612.87 is: 918.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,306.56 : 1,958.76 = 612.87 : x
  2. Step 2: Convert to fraction form
    1,306.56/1,958.76 = 612.87/x
  3. Step 3: Cross multiply
    1,306.56x = 1,958.76 × 612.87
  4. Step 4: Simplify right side
    1,306.56x = 1,200,465.24
  5. Step 5: Solve for x
    x = 1,200,465.24/1,306.56
  6. Step 6: Final answer
    x = 918.80

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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.