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Finding the Fourth Proportional to 355.51, 491.30 and 288.99

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Solution

The fourth proportional to 355.51, 491.30 and 288.99 is: 399.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.51 : 491.30 = 288.99 : x
  2. Step 2: Convert to fraction form
    355.51/491.30 = 288.99/x
  3. Step 3: Cross multiply
    355.51x = 491.30 × 288.99
  4. Step 4: Simplify right side
    355.51x = 141,979.34
  5. Step 5: Solve for x
    x = 141,979.34/355.51
  6. Step 6: Final answer
    x = 399.37

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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.