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Finding the Fourth Proportional to 664.55, 917.09 and 384.77

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Solution

The fourth proportional to 664.55, 917.09 and 384.77 is: 530.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.55 : 917.09 = 384.77 : x
  2. Step 2: Convert to fraction form
    664.55/917.09 = 384.77/x
  3. Step 3: Cross multiply
    664.55x = 917.09 × 384.77
  4. Step 4: Simplify right side
    664.55x = 352,868.72
  5. Step 5: Solve for x
    x = 352,868.72/664.55
  6. Step 6: Final answer
    x = 530.99

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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.