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Finding the Fourth Proportional to 628.39, 866.39 and 403.93

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Solution

The fourth proportional to 628.39, 866.39 and 403.93 is: 556.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.39 : 866.39 = 403.93 : x
  2. Step 2: Convert to fraction form
    628.39/866.39 = 403.93/x
  3. Step 3: Cross multiply
    628.39x = 866.39 × 403.93
  4. Step 4: Simplify right side
    628.39x = 349,955.10
  5. Step 5: Solve for x
    x = 349,955.10/628.39
  6. Step 6: Final answer
    x = 556.91

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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.