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Finding the Fourth Proportional to 437.13, 655.47 and 128.93

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Solution

The fourth proportional to 437.13, 655.47 and 128.93 is: 193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.13 : 655.47 = 128.93 : x
  2. Step 2: Convert to fraction form
    437.13/655.47 = 128.93/x
  3. Step 3: Cross multiply
    437.13x = 655.47 × 128.93
  4. Step 4: Simplify right side
    437.13x = 84,506.47
  5. Step 5: Solve for x
    x = 84,506.47/437.13
  6. Step 6: Final answer
    x = 193.32

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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.