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Finding the Fourth Proportional to 757.50, 1,135.74 and 319.02

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Solution

The fourth proportional to 757.50, 1,135.74 and 319.02 is: 478.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.50 : 1,135.74 = 319.02 : x
  2. Step 2: Convert to fraction form
    757.50/1,135.74 = 319.02/x
  3. Step 3: Cross multiply
    757.50x = 1,135.74 × 319.02
  4. Step 4: Simplify right side
    757.50x = 362,323.77
  5. Step 5: Solve for x
    x = 362,323.77/757.50
  6. Step 6: Final answer
    x = 478.32

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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.