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Finding the Fourth Proportional to 853.96, 1,178.10 and 618.05

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Solution

The fourth proportional to 853.96, 1,178.10 and 618.05 is: 852.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.96 : 1,178.10 = 618.05 : x
  2. Step 2: Convert to fraction form
    853.96/1,178.10 = 618.05/x
  3. Step 3: Cross multiply
    853.96x = 1,178.10 × 618.05
  4. Step 4: Simplify right side
    853.96x = 728,124.71
  5. Step 5: Solve for x
    x = 728,124.71/853.96
  6. Step 6: Final answer
    x = 852.64

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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.