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Finding the Fourth Proportional to 719.62, 992.72 and 470.95

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Solution

The fourth proportional to 719.62, 992.72 and 470.95 is: 649.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.62 : 992.72 = 470.95 : x
  2. Step 2: Convert to fraction form
    719.62/992.72 = 470.95/x
  3. Step 3: Cross multiply
    719.62x = 992.72 × 470.95
  4. Step 4: Simplify right side
    719.62x = 467,520.18
  5. Step 5: Solve for x
    x = 467,520.18/719.62
  6. Step 6: Final answer
    x = 649.68

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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.