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Finding the Fourth Proportional to 620.81, 856.29 and 424.59

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Solution

The fourth proportional to 620.81, 856.29 and 424.59 is: 585.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.81 : 856.29 = 424.59 : x
  2. Step 2: Convert to fraction form
    620.81/856.29 = 424.59/x
  3. Step 3: Cross multiply
    620.81x = 856.29 × 424.59
  4. Step 4: Simplify right side
    620.81x = 363,572.17
  5. Step 5: Solve for x
    x = 363,572.17/620.81
  6. Step 6: Final answer
    x = 585.64

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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.