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Finding the Fourth Proportional to 776.52, 1,164.78 and 391.32

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Solution

The fourth proportional to 776.52, 1,164.78 and 391.32 is: 586.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.52 : 1,164.78 = 391.32 : x
  2. Step 2: Convert to fraction form
    776.52/1,164.78 = 391.32/x
  3. Step 3: Cross multiply
    776.52x = 1,164.78 × 391.32
  4. Step 4: Simplify right side
    776.52x = 455,801.71
  5. Step 5: Solve for x
    x = 455,801.71/776.52
  6. Step 6: Final answer
    x = 586.98

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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.