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Finding the Fourth Proportional to 755.12, 1,036.45 and 670.36

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Solution

The fourth proportional to 755.12, 1,036.45 and 670.36 is: 920.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.12 : 1,036.45 = 670.36 : x
  2. Step 2: Convert to fraction form
    755.12/1,036.45 = 670.36/x
  3. Step 3: Cross multiply
    755.12x = 1,036.45 × 670.36
  4. Step 4: Simplify right side
    755.12x = 694,794.62
  5. Step 5: Solve for x
    x = 694,794.62/755.12
  6. Step 6: Final answer
    x = 920.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.