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Finding the Fourth Proportional to 805.45, 1,125.20 and 805.45

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Solution

The fourth proportional to 805.45, 1,125.20 and 805.45 is: 1,125.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.45 : 1,125.20 = 805.45 : x
  2. Step 2: Convert to fraction form
    805.45/1,125.20 = 805.45/x
  3. Step 3: Cross multiply
    805.45x = 1,125.20 × 805.45
  4. Step 4: Simplify right side
    805.45x = 906,292.34
  5. Step 5: Solve for x
    x = 906,292.34/805.45
  6. Step 6: Final answer
    x = 1,125.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.