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Finding the Fourth Proportional to 776.58, 1,071.36 and 555.09

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Solution

The fourth proportional to 776.58, 1,071.36 and 555.09 is: 765.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.58 : 1,071.36 = 555.09 : x
  2. Step 2: Convert to fraction form
    776.58/1,071.36 = 555.09/x
  3. Step 3: Cross multiply
    776.58x = 1,071.36 × 555.09
  4. Step 4: Simplify right side
    776.58x = 594,701.22
  5. Step 5: Solve for x
    x = 594,701.22/776.58
  6. Step 6: Final answer
    x = 765.80

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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.