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Finding the Fourth Proportional to 564.76, 779.08 and 487

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Solution

The fourth proportional to 564.76, 779.08 and 487 is: 671.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.76 : 779.08 = 487 : x
  2. Step 2: Convert to fraction form
    564.76/779.08 = 487/x
  3. Step 3: Cross multiply
    564.76x = 779.08 × 487
  4. Step 4: Simplify right side
    564.76x = 379,411.96
  5. Step 5: Solve for x
    x = 379,411.96/564.76
  6. Step 6: Final answer
    x = 671.81

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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.