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Finding the Fourth Proportional to 538.53, 743.13 and 390.93

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Solution

The fourth proportional to 538.53, 743.13 and 390.93 is: 539.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.53 : 743.13 = 390.93 : x
  2. Step 2: Convert to fraction form
    538.53/743.13 = 390.93/x
  3. Step 3: Cross multiply
    538.53x = 743.13 × 390.93
  4. Step 4: Simplify right side
    538.53x = 290,511.81
  5. Step 5: Solve for x
    x = 290,511.81/538.53
  6. Step 6: Final answer
    x = 539.45

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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.