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Finding the Fourth Proportional to 805.28, 1,207.11 and 612.50

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Solution

The fourth proportional to 805.28, 1,207.11 and 612.50 is: 918.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.28 : 1,207.11 = 612.50 : x
  2. Step 2: Convert to fraction form
    805.28/1,207.11 = 612.50/x
  3. Step 3: Cross multiply
    805.28x = 1,207.11 × 612.50
  4. Step 4: Simplify right side
    805.28x = 739,354.88
  5. Step 5: Solve for x
    x = 739,354.88/805.28
  6. Step 6: Final answer
    x = 918.13

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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.