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Finding the Fourth Proportional to 665.67, 917.15 and 455.77

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Solution

The fourth proportional to 665.67, 917.15 and 455.77 is: 627.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.67 : 917.15 = 455.77 : x
  2. Step 2: Convert to fraction form
    665.67/917.15 = 455.77/x
  3. Step 3: Cross multiply
    665.67x = 917.15 × 455.77
  4. Step 4: Simplify right side
    665.67x = 418,009.46
  5. Step 5: Solve for x
    x = 418,009.46/665.67
  6. Step 6: Final answer
    x = 627.95

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.