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Finding the Fourth Proportional to 390.17, 538.39 and 259.22

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Solution

The fourth proportional to 390.17, 538.39 and 259.22 is: 357.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.17 : 538.39 = 259.22 : x
  2. Step 2: Convert to fraction form
    390.17/538.39 = 259.22/x
  3. Step 3: Cross multiply
    390.17x = 538.39 × 259.22
  4. Step 4: Simplify right side
    390.17x = 139,561.46
  5. Step 5: Solve for x
    x = 139,561.46/390.17
  6. Step 6: Final answer
    x = 357.69

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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.