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Finding the Fourth Proportional to 1,071.53, 1,478.66 and 617.22

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Solution

The fourth proportional to 1,071.53, 1,478.66 and 617.22 is: 851.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.53 : 1,478.66 = 617.22 : x
  2. Step 2: Convert to fraction form
    1,071.53/1,478.66 = 617.22/x
  3. Step 3: Cross multiply
    1,071.53x = 1,478.66 × 617.22
  4. Step 4: Simplify right side
    1,071.53x = 912,655.44
  5. Step 5: Solve for x
    x = 912,655.44/1,071.53
  6. Step 6: Final answer
    x = 851.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.