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Finding the Fourth Proportional to 776.09, 1,160.56 and 578.79

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Solution

The fourth proportional to 776.09, 1,160.56 and 578.79 is: 865.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.09 : 1,160.56 = 578.79 : x
  2. Step 2: Convert to fraction form
    776.09/1,160.56 = 578.79/x
  3. Step 3: Cross multiply
    776.09x = 1,160.56 × 578.79
  4. Step 4: Simplify right side
    776.09x = 671,720.52
  5. Step 5: Solve for x
    x = 671,720.52/776.09
  6. Step 6: Final answer
    x = 865.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.