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Finding the Fourth Proportional to 900, 1,347.12 and 845.28

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Solution

The fourth proportional to 900, 1,347.12 and 845.28 is: 1,265.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    900 : 1,347.12 = 845.28 : x
  2. Step 2: Convert to fraction form
    900/1,347.12 = 845.28/x
  3. Step 3: Cross multiply
    900x = 1,347.12 × 845.28
  4. Step 4: Simplify right side
    900x = 1,138,693.59
  5. Step 5: Solve for x
    x = 1,138,693.59/900
  6. Step 6: Final answer
    x = 1,265.22

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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.