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Finding the Fourth Proportional to 740.69, 1,021.79 and 445.73

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Solution

The fourth proportional to 740.69, 1,021.79 and 445.73 is: 614.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.69 : 1,021.79 = 445.73 : x
  2. Step 2: Convert to fraction form
    740.69/1,021.79 = 445.73/x
  3. Step 3: Cross multiply
    740.69x = 1,021.79 × 445.73
  4. Step 4: Simplify right side
    740.69x = 455,442.46
  5. Step 5: Solve for x
    x = 455,442.46/740.69
  6. Step 6: Final answer
    x = 614.89

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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.