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Finding the Fourth Proportional to 688.94, 1,030.67 and 611.03

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Solution

The fourth proportional to 688.94, 1,030.67 and 611.03 is: 914.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.94 : 1,030.67 = 611.03 : x
  2. Step 2: Convert to fraction form
    688.94/1,030.67 = 611.03/x
  3. Step 3: Cross multiply
    688.94x = 1,030.67 × 611.03
  4. Step 4: Simplify right side
    688.94x = 629,770.29
  5. Step 5: Solve for x
    x = 629,770.29/688.94
  6. Step 6: Final answer
    x = 914.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.