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Finding the Fourth Proportional to 621.09, 856.29 and 508.68

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Solution

The fourth proportional to 621.09, 856.29 and 508.68 is: 701.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.09 : 856.29 = 508.68 : x
  2. Step 2: Convert to fraction form
    621.09/856.29 = 508.68/x
  3. Step 3: Cross multiply
    621.09x = 856.29 × 508.68
  4. Step 4: Simplify right side
    621.09x = 435,577.60
  5. Step 5: Solve for x
    x = 435,577.60/621.09
  6. Step 6: Final answer
    x = 701.31

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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.