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Finding the Fourth Proportional to 904.57, 1,246.59 and 642.13

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Solution

The fourth proportional to 904.57, 1,246.59 and 642.13 is: 884.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.57 : 1,246.59 = 642.13 : x
  2. Step 2: Convert to fraction form
    904.57/1,246.59 = 642.13/x
  3. Step 3: Cross multiply
    904.57x = 1,246.59 × 642.13
  4. Step 4: Simplify right side
    904.57x = 800,469.72
  5. Step 5: Solve for x
    x = 800,469.72/904.57
  6. Step 6: Final answer
    x = 884.92

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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.