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Finding the Fourth Proportional to 935.16, 1,290.24 and 669.68

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Solution

The fourth proportional to 935.16, 1,290.24 and 669.68 is: 923.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.16 : 1,290.24 = 669.68 : x
  2. Step 2: Convert to fraction form
    935.16/1,290.24 = 669.68/x
  3. Step 3: Cross multiply
    935.16x = 1,290.24 × 669.68
  4. Step 4: Simplify right side
    935.16x = 864,047.92
  5. Step 5: Solve for x
    x = 864,047.92/935.16
  6. Step 6: Final answer
    x = 923.96

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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.