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Finding the Fourth Proportional to 777.13, 1,164.58 and 386.71

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Solution

The fourth proportional to 777.13, 1,164.58 and 386.71 is: 579.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.13 : 1,164.58 = 386.71 : x
  2. Step 2: Convert to fraction form
    777.13/1,164.58 = 386.71/x
  3. Step 3: Cross multiply
    777.13x = 1,164.58 × 386.71
  4. Step 4: Simplify right side
    777.13x = 450,350.85
  5. Step 5: Solve for x
    x = 450,350.85/777.13
  6. Step 6: Final answer
    x = 579.51

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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.