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Finding the Fourth Proportional to 785.62, 1,089.12 and 744.02

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Solution

The fourth proportional to 785.62, 1,089.12 and 744.02 is: 1,031.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.62 : 1,089.12 = 744.02 : x
  2. Step 2: Convert to fraction form
    785.62/1,089.12 = 744.02/x
  3. Step 3: Cross multiply
    785.62x = 1,089.12 × 744.02
  4. Step 4: Simplify right side
    785.62x = 810,327.06
  5. Step 5: Solve for x
    x = 810,327.06/785.62
  6. Step 6: Final answer
    x = 1,031.45

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.