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Finding the Fourth Proportional to 664.70, 916.76 and 564.45

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Solution

The fourth proportional to 664.70, 916.76 and 564.45 is: 778.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.70 : 916.76 = 564.45 : x
  2. Step 2: Convert to fraction form
    664.70/916.76 = 564.45/x
  3. Step 3: Cross multiply
    664.70x = 916.76 × 564.45
  4. Step 4: Simplify right side
    664.70x = 517,462.36
  5. Step 5: Solve for x
    x = 517,462.36/664.70
  6. Step 6: Final answer
    x = 778.50

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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.