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Finding the Fourth Proportional to 839.45, 1,157.16 and 618.02

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Solution

The fourth proportional to 839.45, 1,157.16 and 618.02 is: 851.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.45 : 1,157.16 = 618.02 : x
  2. Step 2: Convert to fraction form
    839.45/1,157.16 = 618.02/x
  3. Step 3: Cross multiply
    839.45x = 1,157.16 × 618.02
  4. Step 4: Simplify right side
    839.45x = 715,142.24
  5. Step 5: Solve for x
    x = 715,142.24/839.45
  6. Step 6: Final answer
    x = 851.92

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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.