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Finding the Fourth Proportional to 767.40, 1,036.80 and 767.40

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Solution

The fourth proportional to 767.40, 1,036.80 and 767.40 is: 1,036.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.40 : 1,036.80 = 767.40 : x
  2. Step 2: Convert to fraction form
    767.40/1,036.80 = 767.40/x
  3. Step 3: Cross multiply
    767.40x = 1,036.80 × 767.40
  4. Step 4: Simplify right side
    767.40x = 795,640.32
  5. Step 5: Solve for x
    x = 795,640.32/767.40
  6. Step 6: Final answer
    x = 1,036.80

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.