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Finding the Fourth Proportional to 654.55, 903.29 and 405.74

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Solution

The fourth proportional to 654.55, 903.29 and 405.74 is: 559.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.55 : 903.29 = 405.74 : x
  2. Step 2: Convert to fraction form
    654.55/903.29 = 405.74/x
  3. Step 3: Cross multiply
    654.55x = 903.29 × 405.74
  4. Step 4: Simplify right side
    654.55x = 366,501.11
  5. Step 5: Solve for x
    x = 366,501.11/654.55
  6. Step 6: Final answer
    x = 559.93

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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.