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Finding the Fourth Proportional to 864.64, 1,190.40 and 688.96

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Solution

The fourth proportional to 864.64, 1,190.40 and 688.96 is: 948.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.64 : 1,190.40 = 688.96 : x
  2. Step 2: Convert to fraction form
    864.64/1,190.40 = 688.96/x
  3. Step 3: Cross multiply
    864.64x = 1,190.40 × 688.96
  4. Step 4: Simplify right side
    864.64x = 820,137.98
  5. Step 5: Solve for x
    x = 820,137.98/864.64
  6. Step 6: Final answer
    x = 948.53

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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.