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Finding the Fourth Proportional to 390.91, 538.28 and 370.83

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Solution

The fourth proportional to 390.91, 538.28 and 370.83 is: 510.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.91 : 538.28 = 370.83 : x
  2. Step 2: Convert to fraction form
    390.91/538.28 = 370.83/x
  3. Step 3: Cross multiply
    390.91x = 538.28 × 370.83
  4. Step 4: Simplify right side
    390.91x = 199,608.52
  5. Step 5: Solve for x
    x = 199,608.52/390.91
  6. Step 6: Final answer
    x = 510.63

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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.