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Finding the Fourth Proportional to 564.34, 846.90 and 391

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Solution

The fourth proportional to 564.34, 846.90 and 391 is: 586.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.34 : 846.90 = 391 : x
  2. Step 2: Convert to fraction form
    564.34/846.90 = 391/x
  3. Step 3: Cross multiply
    564.34x = 846.90 × 391
  4. Step 4: Simplify right side
    564.34x = 331,137.90
  5. Step 5: Solve for x
    x = 331,137.90/564.34
  6. Step 6: Final answer
    x = 586.77

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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.