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Finding the Fourth Proportional to 699.98, 1,048.90 and 407.57

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Solution

The fourth proportional to 699.98, 1,048.90 and 407.57 is: 610.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.98 : 1,048.90 = 407.57 : x
  2. Step 2: Convert to fraction form
    699.98/1,048.90 = 407.57/x
  3. Step 3: Cross multiply
    699.98x = 1,048.90 × 407.57
  4. Step 4: Simplify right side
    699.98x = 427,498.14
  5. Step 5: Solve for x
    x = 427,498.14/699.98
  6. Step 6: Final answer
    x = 610.73

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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.