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Finding the Fourth Proportional to 909.54, 1,362.78 and 875.39

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Solution

The fourth proportional to 909.54, 1,362.78 and 875.39 is: 1,311.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.54 : 1,362.78 = 875.39 : x
  2. Step 2: Convert to fraction form
    909.54/1,362.78 = 875.39/x
  3. Step 3: Cross multiply
    909.54x = 1,362.78 × 875.39
  4. Step 4: Simplify right side
    909.54x = 1,192,957.17
  5. Step 5: Solve for x
    x = 1,192,957.17/909.54
  6. Step 6: Final answer
    x = 1,311.60

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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.