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Finding the Fourth Proportional to 621.76, 856.07 and 528.36

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Solution

The fourth proportional to 621.76, 856.07 and 528.36 is: 727.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.76 : 856.07 = 528.36 : x
  2. Step 2: Convert to fraction form
    621.76/856.07 = 528.36/x
  3. Step 3: Cross multiply
    621.76x = 856.07 × 528.36
  4. Step 4: Simplify right side
    621.76x = 452,309.27
  5. Step 5: Solve for x
    x = 452,309.27/621.76
  6. Step 6: Final answer
    x = 727.47

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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.