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Finding the Fourth Proportional to 654.39, 903.09 and 405.84

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Solution

The fourth proportional to 654.39, 903.09 and 405.84 is: 560.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.39 : 903.09 = 405.84 : x
  2. Step 2: Convert to fraction form
    654.39/903.09 = 405.84/x
  3. Step 3: Cross multiply
    654.39x = 903.09 × 405.84
  4. Step 4: Simplify right side
    654.39x = 366,510.05
  5. Step 5: Solve for x
    x = 366,510.05/654.39
  6. Step 6: Final answer
    x = 560.08

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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.