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Finding the Fourth Proportional to 493.51, 740.22 and 128.29

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Solution

The fourth proportional to 493.51, 740.22 and 128.29 is: 192.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.51 : 740.22 = 128.29 : x
  2. Step 2: Convert to fraction form
    493.51/740.22 = 128.29/x
  3. Step 3: Cross multiply
    493.51x = 740.22 × 128.29
  4. Step 4: Simplify right side
    493.51x = 94,962.82
  5. Step 5: Solve for x
    x = 94,962.82/493.51
  6. Step 6: Final answer
    x = 192.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.