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Finding the Fourth Proportional to 839.64, 1,157.63 and 614.87

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Solution

The fourth proportional to 839.64, 1,157.63 and 614.87 is: 847.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.64 : 1,157.63 = 614.87 : x
  2. Step 2: Convert to fraction form
    839.64/1,157.63 = 614.87/x
  3. Step 3: Cross multiply
    839.64x = 1,157.63 × 614.87
  4. Step 4: Simplify right side
    839.64x = 711,786.77
  5. Step 5: Solve for x
    x = 711,786.77/839.64
  6. Step 6: Final answer
    x = 847.73

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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.