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Finding the Fourth Proportional to 721.56, 1,080 and 477.48

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Solution

The fourth proportional to 721.56, 1,080 and 477.48 is: 714.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.56 : 1,080 = 477.48 : x
  2. Step 2: Convert to fraction form
    721.56/1,080 = 477.48/x
  3. Step 3: Cross multiply
    721.56x = 1,080 × 477.48
  4. Step 4: Simplify right side
    721.56x = 515,678.40
  5. Step 5: Solve for x
    x = 515,678.40/721.56
  6. Step 6: Final answer
    x = 714.67

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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.