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Finding the Fourth Proportional to 747.77, 1,118.93 and 439.77

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Solution

The fourth proportional to 747.77, 1,118.93 and 439.77 is: 658.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.77 : 1,118.93 = 439.77 : x
  2. Step 2: Convert to fraction form
    747.77/1,118.93 = 439.77/x
  3. Step 3: Cross multiply
    747.77x = 1,118.93 × 439.77
  4. Step 4: Simplify right side
    747.77x = 492,069.65
  5. Step 5: Solve for x
    x = 492,069.65/747.77
  6. Step 6: Final answer
    x = 658.05

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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.