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Finding the Fourth Proportional to 757.40, 1,135.61 and 318.93

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Solution

The fourth proportional to 757.40, 1,135.61 and 318.93 is: 478.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.40 : 1,135.61 = 318.93 : x
  2. Step 2: Convert to fraction form
    757.40/1,135.61 = 318.93/x
  3. Step 3: Cross multiply
    757.40x = 1,135.61 × 318.93
  4. Step 4: Simplify right side
    757.40x = 362,178.50
  5. Step 5: Solve for x
    x = 362,178.50/757.40
  6. Step 6: Final answer
    x = 478.19

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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.