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Finding the Fourth Proportional to 872.77, 1,309.29 and 317.53

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Solution

The fourth proportional to 872.77, 1,309.29 and 317.53 is: 476.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.77 : 1,309.29 = 317.53 : x
  2. Step 2: Convert to fraction form
    872.77/1,309.29 = 317.53/x
  3. Step 3: Cross multiply
    872.77x = 1,309.29 × 317.53
  4. Step 4: Simplify right side
    872.77x = 415,733.72
  5. Step 5: Solve for x
    x = 415,733.72/872.77
  6. Step 6: Final answer
    x = 476.34

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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.