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Finding the Fourth Proportional to 747.41, 1,118.71 and 399.87

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Solution

The fourth proportional to 747.41, 1,118.71 and 399.87 is: 598.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.41 : 1,118.71 = 399.87 : x
  2. Step 2: Convert to fraction form
    747.41/1,118.71 = 399.87/x
  3. Step 3: Cross multiply
    747.41x = 1,118.71 × 399.87
  4. Step 4: Simplify right side
    747.41x = 447,338.57
  5. Step 5: Solve for x
    x = 447,338.57/747.41
  6. Step 6: Final answer
    x = 598.52

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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.