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Finding the Fourth Proportional to 565.02, 779.64 and 491.28

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Solution

The fourth proportional to 565.02, 779.64 and 491.28 is: 677.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.02 : 779.64 = 491.28 : x
  2. Step 2: Convert to fraction form
    565.02/779.64 = 491.28/x
  3. Step 3: Cross multiply
    565.02x = 779.64 × 491.28
  4. Step 4: Simplify right side
    565.02x = 383,021.54
  5. Step 5: Solve for x
    x = 383,021.54/565.02
  6. Step 6: Final answer
    x = 677.89

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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.