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Finding the Fourth Proportional to 691.98, 1,038.15 and 301.98

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Solution

The fourth proportional to 691.98, 1,038.15 and 301.98 is: 453.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.98 : 1,038.15 = 301.98 : x
  2. Step 2: Convert to fraction form
    691.98/1,038.15 = 301.98/x
  3. Step 3: Cross multiply
    691.98x = 1,038.15 × 301.98
  4. Step 4: Simplify right side
    691.98x = 313,500.54
  5. Step 5: Solve for x
    x = 313,500.54/691.98
  6. Step 6: Final answer
    x = 453.05

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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.