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Finding the Fourth Proportional to 547.89, 756.15 and 315

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Solution

The fourth proportional to 547.89, 756.15 and 315 is: 434.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.89 : 756.15 = 315 : x
  2. Step 2: Convert to fraction form
    547.89/756.15 = 315/x
  3. Step 3: Cross multiply
    547.89x = 756.15 × 315
  4. Step 4: Simplify right side
    547.89x = 238,187.25
  5. Step 5: Solve for x
    x = 238,187.25/547.89
  6. Step 6: Final answer
    x = 434.74

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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.