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Finding the Fourth Proportional to 809.70, 1,215.45 and 501.90

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Solution

The fourth proportional to 809.70, 1,215.45 and 501.90 is: 753.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.70 : 1,215.45 = 501.90 : x
  2. Step 2: Convert to fraction form
    809.70/1,215.45 = 501.90/x
  3. Step 3: Cross multiply
    809.70x = 1,215.45 × 501.90
  4. Step 4: Simplify right side
    809.70x = 610,034.36
  5. Step 5: Solve for x
    x = 610,034.36/809.70
  6. Step 6: Final answer
    x = 753.41

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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.