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Finding the Fourth Proportional to 610.70, 842.40 and 386.54

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Solution

The fourth proportional to 610.70, 842.40 and 386.54 is: 533.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.70 : 842.40 = 386.54 : x
  2. Step 2: Convert to fraction form
    610.70/842.40 = 386.54/x
  3. Step 3: Cross multiply
    610.70x = 842.40 × 386.54
  4. Step 4: Simplify right side
    610.70x = 325,621.30
  5. Step 5: Solve for x
    x = 325,621.30/610.70
  6. Step 6: Final answer
    x = 533.19

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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.