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Finding the Fourth Proportional to 837.19, 1,155.90 and 640.36

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Solution

The fourth proportional to 837.19, 1,155.90 and 640.36 is: 884.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.19 : 1,155.90 = 640.36 : x
  2. Step 2: Convert to fraction form
    837.19/1,155.90 = 640.36/x
  3. Step 3: Cross multiply
    837.19x = 1,155.90 × 640.36
  4. Step 4: Simplify right side
    837.19x = 740,192.12
  5. Step 5: Solve for x
    x = 740,192.12/837.19
  6. Step 6: Final answer
    x = 884.14

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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.