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Finding the Fourth Proportional to 470.12, 649.08 and 420.92

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Solution

The fourth proportional to 470.12, 649.08 and 420.92 is: 581.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.12 : 649.08 = 420.92 : x
  2. Step 2: Convert to fraction form
    470.12/649.08 = 420.92/x
  3. Step 3: Cross multiply
    470.12x = 649.08 × 420.92
  4. Step 4: Simplify right side
    470.12x = 273,210.75
  5. Step 5: Solve for x
    x = 273,210.75/470.12
  6. Step 6: Final answer
    x = 581.15

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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.