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Finding the Fourth Proportional to 750.68, 1,036.38 and 485.58

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Solution

The fourth proportional to 750.68, 1,036.38 and 485.58 is: 670.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.68 : 1,036.38 = 485.58 : x
  2. Step 2: Convert to fraction form
    750.68/1,036.38 = 485.58/x
  3. Step 3: Cross multiply
    750.68x = 1,036.38 × 485.58
  4. Step 4: Simplify right side
    750.68x = 503,245.40
  5. Step 5: Solve for x
    x = 503,245.40/750.68
  6. Step 6: Final answer
    x = 670.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.