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Finding the Fourth Proportional to 664.29, 916.40 and 564.30

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Solution

The fourth proportional to 664.29, 916.40 and 564.30 is: 778.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.29 : 916.40 = 564.30 : x
  2. Step 2: Convert to fraction form
    664.29/916.40 = 564.30/x
  3. Step 3: Cross multiply
    664.29x = 916.40 × 564.30
  4. Step 4: Simplify right side
    664.29x = 517,125.93
  5. Step 5: Solve for x
    x = 517,125.93/664.29
  6. Step 6: Final answer
    x = 778.46

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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.