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Finding the Fourth Proportional to 740.38, 1,021.58 and 445.65

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Solution

The fourth proportional to 740.38, 1,021.58 and 445.65 is: 614.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.38 : 1,021.58 = 445.65 : x
  2. Step 2: Convert to fraction form
    740.38/1,021.58 = 445.65/x
  3. Step 3: Cross multiply
    740.38x = 1,021.58 × 445.65
  4. Step 4: Simplify right side
    740.38x = 455,268.24
  5. Step 5: Solve for x
    x = 455,268.24/740.38
  6. Step 6: Final answer
    x = 614.91

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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.