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Finding the Fourth Proportional to 309.59, 426.29 and 260.36

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Solution

The fourth proportional to 309.59, 426.29 and 260.36 is: 358.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.59 : 426.29 = 260.36 : x
  2. Step 2: Convert to fraction form
    309.59/426.29 = 260.36/x
  3. Step 3: Cross multiply
    309.59x = 426.29 × 260.36
  4. Step 4: Simplify right side
    309.59x = 110,985.43
  5. Step 5: Solve for x
    x = 110,985.43/309.59
  6. Step 6: Final answer
    x = 358.50

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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.