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Finding the Fourth Proportional to 355.51, 487.71 and 345.91

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Solution

The fourth proportional to 355.51, 487.71 and 345.91 is: 474.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.51 : 487.71 = 345.91 : x
  2. Step 2: Convert to fraction form
    355.51/487.71 = 345.91/x
  3. Step 3: Cross multiply
    355.51x = 487.71 × 345.91
  4. Step 4: Simplify right side
    355.51x = 168,703.77
  5. Step 5: Solve for x
    x = 168,703.77/355.51
  6. Step 6: Final answer
    x = 474.54

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.