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Finding the Fourth Proportional to 785.68, 1,175.56 and 489.24

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Solution

The fourth proportional to 785.68, 1,175.56 and 489.24 is: 732.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.68 : 1,175.56 = 489.24 : x
  2. Step 2: Convert to fraction form
    785.68/1,175.56 = 489.24/x
  3. Step 3: Cross multiply
    785.68x = 1,175.56 × 489.24
  4. Step 4: Simplify right side
    785.68x = 575,130.97
  5. Step 5: Solve for x
    x = 575,130.97/785.68
  6. Step 6: Final answer
    x = 732.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.