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Finding the Fourth Proportional to 740.13, 1,021.30 and 408.47

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Solution

The fourth proportional to 740.13, 1,021.30 and 408.47 is: 563.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.13 : 1,021.30 = 408.47 : x
  2. Step 2: Convert to fraction form
    740.13/1,021.30 = 408.47/x
  3. Step 3: Cross multiply
    740.13x = 1,021.30 × 408.47
  4. Step 4: Simplify right side
    740.13x = 417,170.41
  5. Step 5: Solve for x
    x = 417,170.41/740.13
  6. Step 6: Final answer
    x = 563.64

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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.