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Finding the Fourth Proportional to 802.02, 1,200.93 and 687.21

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Solution

The fourth proportional to 802.02, 1,200.93 and 687.21 is: 1,029.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.02 : 1,200.93 = 687.21 : x
  2. Step 2: Convert to fraction form
    802.02/1,200.93 = 687.21/x
  3. Step 3: Cross multiply
    802.02x = 1,200.93 × 687.21
  4. Step 4: Simplify right side
    802.02x = 825,291.11
  5. Step 5: Solve for x
    x = 825,291.11/802.02
  6. Step 6: Final answer
    x = 1,029.02

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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.