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Finding the Fourth Proportional to 853.74, 1,178.06 and 554.99

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Solution

The fourth proportional to 853.74, 1,178.06 and 554.99 is: 765.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.74 : 1,178.06 = 554.99 : x
  2. Step 2: Convert to fraction form
    853.74/1,178.06 = 554.99/x
  3. Step 3: Cross multiply
    853.74x = 1,178.06 × 554.99
  4. Step 4: Simplify right side
    853.74x = 653,802.85
  5. Step 5: Solve for x
    x = 653,802.85/853.74
  6. Step 6: Final answer
    x = 765.81

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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.