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Finding the Fourth Proportional to 628.90, 945.15 and 549.70

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Solution

The fourth proportional to 628.90, 945.15 and 549.70 is: 826.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.90 : 945.15 = 549.70 : x
  2. Step 2: Convert to fraction form
    628.90/945.15 = 549.70/x
  3. Step 3: Cross multiply
    628.90x = 945.15 × 549.70
  4. Step 4: Simplify right side
    628.90x = 519,548.96
  5. Step 5: Solve for x
    x = 519,548.96/628.90
  6. Step 6: Final answer
    x = 826.12

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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.