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Finding the Fourth Proportional to 756.72, 1,135.51 and 317.90

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Solution

The fourth proportional to 756.72, 1,135.51 and 317.90 is: 477.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.72 : 1,135.51 = 317.90 : x
  2. Step 2: Convert to fraction form
    756.72/1,135.51 = 317.90/x
  3. Step 3: Cross multiply
    756.72x = 1,135.51 × 317.90
  4. Step 4: Simplify right side
    756.72x = 360,980.67
  5. Step 5: Solve for x
    x = 360,980.67/756.72
  6. Step 6: Final answer
    x = 477.03

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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.