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Finding the Fourth Proportional to 939.93, 1,407.39 and 505.77

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Solution

The fourth proportional to 939.93, 1,407.39 and 505.77 is: 757.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.93 : 1,407.39 = 505.77 : x
  2. Step 2: Convert to fraction form
    939.93/1,407.39 = 505.77/x
  3. Step 3: Cross multiply
    939.93x = 1,407.39 × 505.77
  4. Step 4: Simplify right side
    939.93x = 711,815.64
  5. Step 5: Solve for x
    x = 711,815.64/939.93
  6. Step 6: Final answer
    x = 757.31

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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.