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Finding the Fourth Proportional to 309.17, 426.07 and 210.76

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Solution

The fourth proportional to 309.17, 426.07 and 210.76 is: 290.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.17 : 426.07 = 210.76 : x
  2. Step 2: Convert to fraction form
    309.17/426.07 = 210.76/x
  3. Step 3: Cross multiply
    309.17x = 426.07 × 210.76
  4. Step 4: Simplify right side
    309.17x = 89,798.51
  5. Step 5: Solve for x
    x = 89,798.51/309.17
  6. Step 6: Final answer
    x = 290.45

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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.