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Finding the Fourth Proportional to 470.21, 703.89 and 253.13

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Solution

The fourth proportional to 470.21, 703.89 and 253.13 is: 378.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.21 : 703.89 = 253.13 : x
  2. Step 2: Convert to fraction form
    470.21/703.89 = 253.13/x
  3. Step 3: Cross multiply
    470.21x = 703.89 × 253.13
  4. Step 4: Simplify right side
    470.21x = 178,172.16
  5. Step 5: Solve for x
    x = 178,172.16/470.21
  6. Step 6: Final answer
    x = 378.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.