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Finding the Fourth Proportional to 958.72, 1,429.88 and 899.92

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Solution

The fourth proportional to 958.72, 1,429.88 and 899.92 is: 1,342.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.72 : 1,429.88 = 899.92 : x
  2. Step 2: Convert to fraction form
    958.72/1,429.88 = 899.92/x
  3. Step 3: Cross multiply
    958.72x = 1,429.88 × 899.92
  4. Step 4: Simplify right side
    958.72x = 1,286,777.61
  5. Step 5: Solve for x
    x = 1,286,777.61/958.72
  6. Step 6: Final answer
    x = 1,342.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.