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Finding the Fourth Proportional to 669.92, 918.46 and 657.59

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Solution

The fourth proportional to 669.92, 918.46 and 657.59 is: 901.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.92 : 918.46 = 657.59 : x
  2. Step 2: Convert to fraction form
    669.92/918.46 = 657.59/x
  3. Step 3: Cross multiply
    669.92x = 918.46 × 657.59
  4. Step 4: Simplify right side
    669.92x = 603,970.11
  5. Step 5: Solve for x
    x = 603,970.11/669.92
  6. Step 6: Final answer
    x = 901.56

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.