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Finding the Fourth Proportional to 620.10, 855.77 and 340.35

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Solution

The fourth proportional to 620.10, 855.77 and 340.35 is: 469.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.10 : 855.77 = 340.35 : x
  2. Step 2: Convert to fraction form
    620.10/855.77 = 340.35/x
  3. Step 3: Cross multiply
    620.10x = 855.77 × 340.35
  4. Step 4: Simplify right side
    620.10x = 291,260.26
  5. Step 5: Solve for x
    x = 291,260.26/620.10
  6. Step 6: Final answer
    x = 469.70

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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.