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Finding the Fourth Proportional to 620.74, 856.80 and 497.26

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Solution

The fourth proportional to 620.74, 856.80 and 497.26 is: 686.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.74 : 856.80 = 497.26 : x
  2. Step 2: Convert to fraction form
    620.74/856.80 = 497.26/x
  3. Step 3: Cross multiply
    620.74x = 856.80 × 497.26
  4. Step 4: Simplify right side
    620.74x = 426,052.37
  5. Step 5: Solve for x
    x = 426,052.37/620.74
  6. Step 6: Final answer
    x = 686.36

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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.