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Finding the Fourth Proportional to 902.58, 1,242.35 and 640.14

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Solution

The fourth proportional to 902.58, 1,242.35 and 640.14 is: 881.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.58 : 1,242.35 = 640.14 : x
  2. Step 2: Convert to fraction form
    902.58/1,242.35 = 640.14/x
  3. Step 3: Cross multiply
    902.58x = 1,242.35 × 640.14
  4. Step 4: Simplify right side
    902.58x = 795,277.93
  5. Step 5: Solve for x
    x = 795,277.93/902.58
  6. Step 6: Final answer
    x = 881.12

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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.