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Finding the Fourth Proportional to 665.95, 918.76 and 664.92

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Solution

The fourth proportional to 665.95, 918.76 and 664.92 is: 917.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.95 : 918.76 = 664.92 : x
  2. Step 2: Convert to fraction form
    665.95/918.76 = 664.92/x
  3. Step 3: Cross multiply
    665.95x = 918.76 × 664.92
  4. Step 4: Simplify right side
    665.95x = 610,901.90
  5. Step 5: Solve for x
    x = 610,901.90/665.95
  6. Step 6: Final answer
    x = 917.35

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Double scale
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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.