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Finding the Fourth Proportional to 688.98, 1,032.45 and 543.09

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Solution

The fourth proportional to 688.98, 1,032.45 and 543.09 is: 813.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.98 : 1,032.45 = 543.09 : x
  2. Step 2: Convert to fraction form
    688.98/1,032.45 = 543.09/x
  3. Step 3: Cross multiply
    688.98x = 1,032.45 × 543.09
  4. Step 4: Simplify right side
    688.98x = 560,707.12
  5. Step 5: Solve for x
    x = 560,707.12/688.98
  6. Step 6: Final answer
    x = 813.82

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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.