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Finding the Fourth Proportional to 850.15, 1,172.64 and 686.13

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Solution

The fourth proportional to 850.15, 1,172.64 and 686.13 is: 946.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.15 : 1,172.64 = 686.13 : x
  2. Step 2: Convert to fraction form
    850.15/1,172.64 = 686.13/x
  3. Step 3: Cross multiply
    850.15x = 1,172.64 × 686.13
  4. Step 4: Simplify right side
    850.15x = 804,583.48
  5. Step 5: Solve for x
    x = 804,583.48/850.15
  6. Step 6: Final answer
    x = 946.40

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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.