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Finding the Fourth Proportional to 313.75, 469.85 and 253.00

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Solution

The fourth proportional to 313.75, 469.85 and 253.00 is: 378.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.75 : 469.85 = 253.00 : x
  2. Step 2: Convert to fraction form
    313.75/469.85 = 253.00/x
  3. Step 3: Cross multiply
    313.75x = 469.85 × 253.00
  4. Step 4: Simplify right side
    313.75x = 118,869.61
  5. Step 5: Solve for x
    x = 118,869.61/313.75
  6. Step 6: Final answer
    x = 378.87

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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.