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Finding the Fourth Proportional to 719.24, 992.39 and 470.91

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Solution

The fourth proportional to 719.24, 992.39 and 470.91 is: 649.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.24 : 992.39 = 470.91 : x
  2. Step 2: Convert to fraction form
    719.24/992.39 = 470.91/x
  3. Step 3: Cross multiply
    719.24x = 992.39 × 470.91
  4. Step 4: Simplify right side
    719.24x = 467,324.02
  5. Step 5: Solve for x
    x = 467,324.02/719.24
  6. Step 6: Final answer
    x = 649.75

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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.