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Finding the Fourth Proportional to 610.90, 842.95 and 345.35

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Solution

The fourth proportional to 610.90, 842.95 and 345.35 is: 476.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.90 : 842.95 = 345.35 : x
  2. Step 2: Convert to fraction form
    610.90/842.95 = 345.35/x
  3. Step 3: Cross multiply
    610.90x = 842.95 × 345.35
  4. Step 4: Simplify right side
    610.90x = 291,112.78
  5. Step 5: Solve for x
    x = 291,112.78/610.90
  6. Step 6: Final answer
    x = 476.53

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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.