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Finding the Fourth Proportional to 785.90, 1,176.80 and 511.16

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Solution

The fourth proportional to 785.90, 1,176.80 and 511.16 is: 765.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.90 : 1,176.80 = 511.16 : x
  2. Step 2: Convert to fraction form
    785.90/1,176.80 = 511.16/x
  3. Step 3: Cross multiply
    785.90x = 1,176.80 × 511.16
  4. Step 4: Simplify right side
    785.90x = 601,524.65
  5. Step 5: Solve for x
    x = 601,524.65/785.90
  6. Step 6: Final answer
    x = 765.40

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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.