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Finding the Fourth Proportional to 721.33, 1,077.12 and 717.01

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Solution

The fourth proportional to 721.33, 1,077.12 and 717.01 is: 1,070.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.33 : 1,077.12 = 717.01 : x
  2. Step 2: Convert to fraction form
    721.33/1,077.12 = 717.01/x
  3. Step 3: Cross multiply
    721.33x = 1,077.12 × 717.01
  4. Step 4: Simplify right side
    721.33x = 772,303.12
  5. Step 5: Solve for x
    x = 772,303.12/721.33
  6. Step 6: Final answer
    x = 1,070.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.