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Finding the Fourth Proportional to 453.39, 625.86 and 390.13

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Solution

The fourth proportional to 453.39, 625.86 and 390.13 is: 538.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.39 : 625.86 = 390.13 : x
  2. Step 2: Convert to fraction form
    453.39/625.86 = 390.13/x
  3. Step 3: Cross multiply
    453.39x = 625.86 × 390.13
  4. Step 4: Simplify right side
    453.39x = 244,166.76
  5. Step 5: Solve for x
    x = 244,166.76/453.39
  6. Step 6: Final answer
    x = 538.54

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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.