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Finding the Fourth Proportional to 750.67, 1,036.21 and 645.34

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Solution

The fourth proportional to 750.67, 1,036.21 and 645.34 is: 890.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.67 : 1,036.21 = 645.34 : x
  2. Step 2: Convert to fraction form
    750.67/1,036.21 = 645.34/x
  3. Step 3: Cross multiply
    750.67x = 1,036.21 × 645.34
  4. Step 4: Simplify right side
    750.67x = 668,707.76
  5. Step 5: Solve for x
    x = 668,707.76/750.67
  6. Step 6: Final answer
    x = 890.81

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1.5x scale

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.