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Finding the Fourth Proportional to 887.45, 1,223.49 and 621.54

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Solution

The fourth proportional to 887.45, 1,223.49 and 621.54 is: 856.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.45 : 1,223.49 = 621.54 : x
  2. Step 2: Convert to fraction form
    887.45/1,223.49 = 621.54/x
  3. Step 3: Cross multiply
    887.45x = 1,223.49 × 621.54
  4. Step 4: Simplify right side
    887.45x = 760,441.86
  5. Step 5: Solve for x
    x = 760,441.86/887.45
  6. Step 6: Final answer
    x = 856.88

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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.