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Finding the Fourth Proportional to 630.80, 946.20 and 549.80

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Solution

The fourth proportional to 630.80, 946.20 and 549.80 is: 824.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.80 : 946.20 = 549.80 : x
  2. Step 2: Convert to fraction form
    630.80/946.20 = 549.80/x
  3. Step 3: Cross multiply
    630.80x = 946.20 × 549.80
  4. Step 4: Simplify right side
    630.80x = 520,220.76
  5. Step 5: Solve for x
    x = 520,220.76/630.80
  6. Step 6: Final answer
    x = 824.70

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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.