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Finding the Fourth Proportional to 750.69, 1,036.26 and 485.21

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Solution

The fourth proportional to 750.69, 1,036.26 and 485.21 is: 669.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.69 : 1,036.26 = 485.21 : x
  2. Step 2: Convert to fraction form
    750.69/1,036.26 = 485.21/x
  3. Step 3: Cross multiply
    750.69x = 1,036.26 × 485.21
  4. Step 4: Simplify right side
    750.69x = 502,806.31
  5. Step 5: Solve for x
    x = 502,806.31/750.69
  6. Step 6: Final answer
    x = 669.79

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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.