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Finding the Fourth Proportional to 812.50, 1,219.95 and 483.99

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Solution

The fourth proportional to 812.50, 1,219.95 and 483.99 is: 726.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.50 : 1,219.95 = 483.99 : x
  2. Step 2: Convert to fraction form
    812.50/1,219.95 = 483.99/x
  3. Step 3: Cross multiply
    812.50x = 1,219.95 × 483.99
  4. Step 4: Simplify right side
    812.50x = 590,439.03
  5. Step 5: Solve for x
    x = 590,439.03/812.50
  6. Step 6: Final answer
    x = 726.70

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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.