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Finding the Fourth Proportional to 740.21, 1,021.57 and 553.37

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Solution

The fourth proportional to 740.21, 1,021.57 and 553.37 is: 763.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.21 : 1,021.57 = 553.37 : x
  2. Step 2: Convert to fraction form
    740.21/1,021.57 = 553.37/x
  3. Step 3: Cross multiply
    740.21x = 1,021.57 × 553.37
  4. Step 4: Simplify right side
    740.21x = 565,299.70
  5. Step 5: Solve for x
    x = 565,299.70/740.21
  6. Step 6: Final answer
    x = 763.71

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Double scale
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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.