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Finding the Fourth Proportional to 620.61, 856.50 and 358.63

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Solution

The fourth proportional to 620.61, 856.50 and 358.63 is: 494.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.61 : 856.50 = 358.63 : x
  2. Step 2: Convert to fraction form
    620.61/856.50 = 358.63/x
  3. Step 3: Cross multiply
    620.61x = 856.50 × 358.63
  4. Step 4: Simplify right side
    620.61x = 307,164.80
  5. Step 5: Solve for x
    x = 307,164.80/620.61
  6. Step 6: Final answer
    x = 494.94

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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.