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Finding the Fourth Proportional to 875.05, 1,203.20 and 838.60

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Solution

The fourth proportional to 875.05, 1,203.20 and 838.60 is: 1,153.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.05 : 1,203.20 = 838.60 : x
  2. Step 2: Convert to fraction form
    875.05/1,203.20 = 838.60/x
  3. Step 3: Cross multiply
    875.05x = 1,203.20 × 838.60
  4. Step 4: Simplify right side
    875.05x = 1,008,999.33
  5. Step 5: Solve for x
    x = 1,008,999.33/875.05
  6. Step 6: Final answer
    x = 1,153.08

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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.