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Finding the Fourth Proportional to 785.30, 1,081.24 and 667.02

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Solution

The fourth proportional to 785.30, 1,081.24 and 667.02 is: 918.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.30 : 1,081.24 = 667.02 : x
  2. Step 2: Convert to fraction form
    785.30/1,081.24 = 667.02/x
  3. Step 3: Cross multiply
    785.30x = 1,081.24 × 667.02
  4. Step 4: Simplify right side
    785.30x = 721,211.09
  5. Step 5: Solve for x
    x = 721,211.09/785.30
  6. Step 6: Final answer
    x = 918.40

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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.