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Finding the Fourth Proportional to 1,121.89, 1,543.05 and 900.35

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Solution

The fourth proportional to 1,121.89, 1,543.05 and 900.35 is: 1,238.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.89 : 1,543.05 = 900.35 : x
  2. Step 2: Convert to fraction form
    1,121.89/1,543.05 = 900.35/x
  3. Step 3: Cross multiply
    1,121.89x = 1,543.05 × 900.35
  4. Step 4: Simplify right side
    1,121.89x = 1,389,285.07
  5. Step 5: Solve for x
    x = 1,389,285.07/1,121.89
  6. Step 6: Final answer
    x = 1,238.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.